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Thread: 6.5 TD Highway Mileage Poll by GMC Hauler

  1. #1
    Join Date
    Oct 2003
    Location
    Maine
    Posts
    642

    Arrow 6.5 TD Highway Mileage Poll by GMC Hauler

    Ok. I finally got the information together, and here it is. Please respond in number to each question. If you have any notes or deviations from the included options that you believe are signifigant, please make a note. If you want to ask questions before posting, send me a PM.

    1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify):
    2. Level 1500, 2500, 3500, 3500 dual rear wheels:
    3. 4x4 or 2x4:
    4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:
    5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor:
    6. Fuel additive added every fillup in OZ; number or none:
    7. Size of fuel tank (Suburban is 42 gal):
    8. Rear Gear Size (3.23, 3.55, 4.10, ect):
    9. Tire Size (ex; 245/75 R16):
    10. Tread style; Offroad, Mud/Snow, Highway:
    11. Gear vendor? (if so, od/ud ratio and how you use it):
    12. Boost control; Mechanical/Electrical:
    13. Boost pressure setting (4-20lbs):
    14. Manual/Automatic Trans:
    15. Thermostat (160, 180, 190, 195, 205, 215, none):
    16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):
    17. Timing Gear Y/N:
    18. Intercoooled Y/N:
    19. Mist injection Y/N:
    20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter):
    21. EGR/Non EGR:
    22. GM Turbo Style (GM5,6,8, other):
    23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other)
    24. TDC offset set to (stock, or the value you have it set to):
    25. Stock injectors/High pop:
    26. Synthetic oil Y/N:
    27. Highway mileage (not towing, best averaged over 3 tanks):
    28. When mileage data was obtained (Winter, Summer):
    29. Approx miles on vehicle:

    This is the items I could come up with that should affect mileage. I will store this data, and use graphs and a table to organize the data. If you have items on your rig that arent used in your calculation for mileage then make a note or don't include them (such as mist injection). I will report after we get enough data to start showing a trend.

  2. #2
    16gaSxS is offline Moderator, Have Shotgun & dogs will travel
    Join Date
    May 2002
    Location
    Great Falls, MT
    Posts
    1,014

    Default GMC Haulers Poll

    1. Short bed Extented cab
    2. 2500
    3. 2x4
    4. 3
    5. 3
    6. PowerService 3-4 oz everytime
    7. 26 gal. plus 38 gallon aux.
    8. 3.42 gears
    9. 245/75/16
    10. mud/snow
    11. no
    12. Mech
    13. up to 14 PSI
    14. Auto Tranny
    15. 195 degree
    16. Heath 2.0
    17. no
    18. no
    19. no
    20. stock air boxx with AFE filter
    21. EGR
    22. GM 4
    23. 3 inch madrel straight through muffler.....kitty ran away
    24. TDC offset stock -0.5
    25. Stock style
    26. yes Rotella 5w-40
    27. 19.7 @ 75, 20.6 @70, 21.4 @65
    28. summer
    29. 204,000 now owned since new,
    95, 6.5, C-2500 extended cab shortbox, Auto transmixer 3.42 diff, Jardine exhaust system
    FSD Cooler replaced w/ Heath PMD Isolator
    Heath Turbo-Master Boost Controller, Max E Tork chip '97 cooling upgrades, Kennedy Fan clutch,
    Glow Plug over ride,DeeZee 38.5 gallon Aux fuel Tank 225K miles and rolling

    1994, 6.5 Blazer, 3:42 diff, 4 inch exhaust, Heath PMD Isolator, Heath Turbo-Master Boost Controller Max E Tork, Heath SB intake filter system.
    221K miles and rolling.
    Diesel Page member #81

  3. #3
    Join Date
    Nov 2001
    Location
    Aitkin, MN
    Posts
    1,986

    Default

    [font=times]Good Day!

    1995 Pickup

    1. What model do you drive: Truck Extended Cab
    2. Level: 2500 SRW
    3. 4x4 or 2x4: 4x4
    4. Driving Habits; 1 to 5 with 1 being conservative and 5 being a lead foot: 1
    5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor: 5 (What
    82 6.2NA K15 4X4 pickup, 4spd man w/ OD, 335K+ "In Rust We Trust" (parked)
    95 6.5TD 2500 4X4 pickup, Gear Vendors Aux. OD, > ¼ million miles - gone
    95 6.5TD 1500 4X4 3/4T Suburban, Kennedy exhaust, > ¼ million miles
    93 6.5TD 3500 4X4 1T crew cab LB pickup, 230k miles

  4. #4
    Join Date
    Dec 2005
    Posts
    20

    Default Gas mileage

    1- 94 Suburban
    2- 2500
    3- 4x4
    4- 1
    5- 3
    6- none
    7- 42
    8- 4.10
    9- 245/75/r16
    10- mud/snow
    11- none
    12- mechanical
    13- ??, stock
    14- Auto trans
    15- 190
    16- stock
    17- stock
    18- none
    19- none
    20- AFE stage 2 intake system
    21- EGR
    22- stock
    23- 4"
    24- stock
    25- stock
    26- no
    27- ??, purchased in Dec., so far 17.5 mixed driving
    28- Winter
    29- 200500 on vehicle, 16500 on new engine
    1994 Chev Suburban 6.5L turbo, AFE Stage 2 air intake system,Triple guage, pillar mount, Jardine Pinnacle Power Exhaust, 4" system, 3" downpipe, '97 cooling mods, deep trans pan, remote FSD from Kennedy mounted on drivers firewall, Kennedy's mild chip (and what a difference it makes, wow), Kennedy's special fan clutch and new metal blades.

  5. #5
    Join Date
    Feb 2003
    Location
    Grand Rapids MN 55744
    Posts
    1,648

    Default Dvldog 3500

    1. What model do you drive- Crew cab long box
    2. Level- 3500 single rears
    3. 4x4
    4. Driving Habits; 1 to 5- 4.5
    5. Tune of vehicle; 1 to 5- 1.5
    6. Fuel additive- Yes, mix of Powerservice, FPPF and two stroke
    7. Size of fuel tank- 32
    8. Rear Gear Size 4:10 locker Maghytech and sythetic
    9. Tire Size 245-75 load E
    10. Tread style; Mud/Snow
    11. Gear vendor- Yes .78OD, runs in Autodrive all the time (on above 48mph)
    12. Boost control; Mechanical NO VAC PUMP
    13. Boost pressure setting- MAX is 15psi
    14. Automatic Trans w/ maghytech and synthetic fluid
    15. Thermostat- Stock
    16. PCM programming Heath 2.0,
    17. Timing Gear NO
    18. Intercoooled Yes
    19. Mist injection No
    20. Air filter- UNI with air path opend as much as possible`
    21. Non EGR:
    22. GM8 Turbo
    23. Exhaust- Wide open JK 3.5
    24. TDC offset set to 1.945
    25. High pop injectors
    26. Synthetic oil Mobile Delvac
    27. Highway mileage- Best observed 22MPG, realistic average- 18-19
    28. When mileage data- Summer
    29. Approx miles on vehicle: 170,000 (50,000 on new motor)
    1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
    1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
    2001 Chinook RV, V10 gas
    1974 John Deere 1530 diesel tractor
    1993 John Deere 455 Diesel lawn mower
    1967 GTO, 1989 Honda Transalp
    2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
    1998 6.5 suburban, stock, daughter's
    1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's

    1984 6.2 ATS turbo 3500, SCDWLB - Son's
    3 kids, 1 wife, 1 dog
    Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!

  6. #6
    Join Date
    Oct 2003
    Location
    Lacombe, Alberta
    Posts
    119

    Default

    1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify):
    2. Level 1500, 2500, 3500, 3500 dual rear wheels:
    3. 4x4 or 2x4:
    4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:
    5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor:
    6. Fuel additive added every fillup in OZ; number or none:
    7. Size of fuel tank (Suburban is 42 gal):
    8. Rear Gear Size (3.23, 3.55, 4.10, ect):
    9. Tire Size (ex; 245/75 R16):
    10. Tread style; Offroad, Mud/Snow, Highway:
    11. Gear vendor? (if so, od/ud ratio and how you use it):
    12. Boost control; Mechanical/Electrical:
    13. Boost pressure setting (4-20lbs):
    14. Manual/Automatic Trans:
    15. Thermostat (160, 180, 190, 195, 205, 215, none):
    16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):
    17. Timing Gear Y/N:
    18. Intercoooled Y/N:
    19. Mist injection Y/N:
    20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter):
    21. EGR/Non EGR:
    22. GM Turbo Style (GM5,6,8, other):
    23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other)
    24. TDC offset set to (stock, or the value you have it set to):
    25. Stock injectors/High pop:
    26. Synthetic oil Y/N:
    27. Highway mileage (not towing, best averaged over 3 tanks):
    28. When mileage data was obtained (Winter, Summer):
    29. Approx miles on vehicle:

    1. Extended Cab shortbed
    2. 2500
    3. 4X4
    4. 3
    5. 3
    6. none
    7. 25 gal
    8. 3.73
    9. 245/75 R16
    10. Mud/Snow
    11. no
    12. Electrical
    13. n/a
    14. Automatic
    15. Stock from new? Not sure what that is
    16. Stock
    17. N
    18. Y
    19. N
    20. stock airbox with K&N filter
    21. Non EGR
    22. GM8
    23. 3" crossover, 3" downpipe, 3" through Flowmaster Muffler, Cat removed.
    24. stock
    25. stock injectors
    26. N
    27. 18
    28. Summer
    29. 155350
    1997 Chevy K2500 E/C Auto - K & N Filter, 3" exhaust, no cat. Midas Flowmaster muffler, Kennedy ECM, Peninsular Diesel Marine upper intake manifold, 3-gauge 'B' Pillar gauge pod, Autometer Phantom gauges, Boost, EGT, and Tranny temp. Homemade air/air intercooler setup, with puller fan. Phazer Gear timing, Fluidampr harmonic balancer, 250,000 kms.
    2009 25' Springdale 5th wheel trailer
    1978 Z28 4sp Camaro (in middle of restoring it)
    1963 Dodge 2 dr. Hdtp., Model 440 (will be a Max Wedge clone)
    1979 GL1000 (Honda Goldwing)

  7. #7
    Join Date
    Mar 2000
    Location
    Seattle, WA USA
    Posts
    73

    Default I bet I get the lowest MPG

    1. 1999 Suburban
    2. 2500
    3. 4x4
    4. Driving Habits: 2
    5. Tune of vehicle: 1
    6. Powerservice 8oz
    7. 42 Gallons
    8. 3.73
    9. 265/75-16
    10. BFG A/T
    11. Gear vendor? No
    12. Mechanical Turbo-Master
    13. 15lbs max when towing up mountain passes
    14. Auto trans
    15. Factory Original t-stats
    16. Heath 2.0
    17. Timing Gear Y/N: No
    18. Intercoooled Y/N: No
    19. Mist injection Y/N: No
    20. Stock airbox w/ AFE filter
    21. Non EGR
    22. Factory Original Turbo
    23. 3" mandrel all the way, cat's still there for now.
    24. TDC offset set to: -1.94
    25. Factory Original injectors
    26. Synthetic oil Y/N: No
    27. Highway mileage @ 65-70mph (and speedo is accurate): 16mpg
    28. When mileage data was obtained (Winter, Summer): Combined
    29. Approx miles on vehicle: 66000
    99 K2500 Suburban LT 6.5TD 3.73 1-owner 69k miles
    Heath Diesel 3" exhaust, Max-E-Tork, PMD isolator, Turbo-Master
    X-Monitor Boost/Pyro/Tranny
    DSG Light booster

  8. #8
    Join Date
    Aug 2005
    Location
    Siloam Springs, Arkansas
    Posts
    116

    Default

    1. Model: truck extended cab
    2. Level: 2500
    3. 4x4
    4. Driving habits: 3
    5. Tune: 3
    6. Fuel additive: power service, 16 oz
    7. Tank size: 32 gal
    8. Gears: 3.73
    9. Tires: 265/75/R16
    10. Tread style: all terrain??
    11. Gear vendors: nope
    12. Boost control: factory electrical
    13. Boost pressure: 5 psi avg.
    14. Auto tranny
    15. Thermostats: factory (need to be replaced...)
    16. PCM: factory
    17. Timing gear: no
    18. Intercooled: no
    19. W/M inject: no
    20. Air filter: stock
    21. non EGR
    22. Turbo: stock
    23. Exhaust: 3.5", no cat
    24. TDCO: stock
    25. injectors: stock
    26. Synthetic: no
    27. Highway mileage: 16
    28. When: winter (summer is similar)
    29. Miles: 137k
    2007 Dodge Ram 2500 quad cab, long bed. 5.9L Cummins, G56 6 speed manual, 4 x 4.

    SOLD: 1996 GMC K2500 ex. cab 6.5 TD, auto, ditched K&N now WIX, aftermarket 3 1/2" exhaust & ISSPRO Pyro/boost/trans temp. 161K, Turbo Master, manual glow control, fast idle switch, Custom IAT gauge, reverse lights, Custom headache rack

    1961 Chevy K20 LB stepside, 350 TBI, 4 speed, on board air, air seat, tons of other stuff...


  9. #9
    Join Date
    Nov 2005
    Location
    Cocoa, Florida
    Posts
    14

    Default

    1 - Suburban
    2 - 1500
    3 - 4X4
    4 - 2
    5 - 3
    6 - 16oz PS Gray
    7 - 42 gal
    8 - 4.10
    9 - LT245 75R16
    10 - Highway
    11 - NO
    12 - Elec
    13 - Fact
    14 - Auto
    15 - 180
    16 - Fact
    17 - NO
    18 - NO
    19 - NO
    20 - K&N
    21 - EGR
    22 - Fact
    23 - Stock
    24 - Stock
    25 - Stock
    26 - YES 15-50 Mobil 1
    27 - 17 mpg
    28 - It's always summer here
    29 - 265,000
    87 6.2 4WD Suburban<br />96 6.5 TD 4WD Suburban, bone stock drivetrain, 2001 GMC wheels, pillar gauges - TT & Boost, Kennedy FSD

  10. #10
    Join Date
    Sep 2003
    Location
    Howell, MI
    Posts
    181

    Default

    1.CREW CAB LONG BED
    2.3500
    3.4x4
    4.2 no more than 70 on hway
    5.2
    6.no
    7.35 factory add on 30 gals in bed
    8.4.10
    9.235/85
    10.mud/snow
    11.no
    12.mech
    13.20 max
    14.auto
    15.195
    16.factory (changing soon)
    17.n
    18.yes
    19.n
    20.K&N off turbo
    21.non
    22.GM5
    23.3.5 downpipe 4.5 straight no muffler
    24.not sure
    25.stock
    26.n
    27.14
    28.summer
    29.165,000
    -96 6.5TD K3500 Crew Cab Dually 4x4, 97 cooling mods, Dmax fan, 3.5" downpipe, 4.5" straight exhaust, intercooler, custom intake plenum, fast idle switch, Ranch Hand bumpers, Turbo Master, egt, boost, & trans gauges, 6" Superlift, K&N off the turbo.
    -88 6.2 3/4 burban 255K
    -83 6.2 CC C30 220K
    -82 6.2 1/2 4x4 burban 270K

  11. #11
    Join Date
    Apr 2004
    Location
    Virginia
    Posts
    127

    Default

    1. Suburban
    2. 2500
    3. 4x4
    4. 4
    5. 3
    6. none
    7. 42
    8. 3.73
    9. 245/75 R16
    10. Highway
    11. No
    12. Mechanical - Heath
    13. Approximately stock
    14. auto (4L80E)
    15. GM stock, not sure what temp - just what the dealer gave me
    16. Stock
    17. Stock
    18. No Intercooler
    19. No water injection
    20. stock w/ airbox mods
    21. Non EGR:
    22. Stock turbo for '94 Suburban (don't know name)
    23. Exhaust - Heath crossover pipe, the rest is stock
    24. TDC offset - never checked since owning vehical
    25. Stock injectors
    26. dino oil
    27. Highway mileage 15.5
    28. When mileage data was obtained (Winter, Summer): every single tank
    29. Approx miles on vehicle: 250k
    Eric
    '94 4x4 2500 6.5TD Suburban
    http://sofadog.net/6.5TD/ (work in progress like the truck)

  12. #12
    Join Date
    Jan 2003
    Location
    Seattle
    Posts
    1

    Default 1999 Suburban K1500

    1. Model: Suburban
    2. Level 1500
    3. 4x4
    4. Driving Habits: 3
    5. Tune of vehicle; 2
    6. Fuel additive added every fillup in OZ: none
    7. Size of fuel tank (Suburban is 42 gal)
    8. Rear Gear Size: 3.55.
    9. Tire Size: 245/75 R16
    10. Tread style: Highway
    11. Gear vendor: none.
    12. Boost control: stock
    13. Boost pressure setting (4-20lbs): stock
    14. Manual/Automatic Trans: Automatic
    15. Thermostat (160, 180, 190, 195, 205, 215, none): stock
    16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): none
    17. Timing Gear Y/N: stock
    18. Intercoooled Y/N: stock
    19. Mist injection Y/N: stock
    20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter): stock
    21. EGR/Non EGR: stock
    22. GM Turbo Style (GM5,6,8, other): stock
    23. Exhaust: stock
    24. TDC offset set to (stock, or the value you have it set to): stock
    25. Stock injectors/High pop: stock
    26. Synthetic oil Y/N: No -- DELO
    27. Highway mileage (not towing, best averaged over 3 tanks): 19.5
    28. When mileage data was obtained: Summer
    29. Approx miles on vehicle: 60000 (only used on weekends/trips)

    _Scott

  13. #13
    Join Date
    Jan 2005
    Location
    L.I. NY>
    Posts
    233

    Default

    1 Suburban
    2 2500
    3 4x4
    4 2
    5 2
    6 Stanadyne blue + 1QT clean engine oil
    7 42
    8 4:10
    9 265x75x16
    10 Hwy
    11 -
    12 Mech. TM
    13 9
    14 Auto
    15 195'
    16 stock
    17 no
    18 no
    19 no
    20 stock
    21 non- EGR
    22 stock
    23 stock
    24 -1.94
    25 stock orig.
    26 no
    27 17
    28 Spring
    29 117,000
    99 sub 2500, 326,000mi, 4:10, 265-75-16 rubber, remote Dtech fsd and turbo master from Heath Isspro pyrometer and boost gauge-Kennedy, 1.94 TDCO, 3" custom bent exh.
    07 Suburban,08 LMM, Allison 6 speed.

  14. #14
    Join Date
    Oct 2003
    Location
    Maine
    Posts
    642

    Default Guess I should answer my own poll...

    1. What model do you drive: Suburban
    2. Level :2500
    3. 4x4 or 2x4: 4x4
    4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:3
    5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor: 2
    6. Fuel additive added every fillup in OZ; number or none:16
    7. Size of fuel tank (Suburban is 42 gal):42
    8. Rear Gear Size (3.23, 3.55, 4.10, ect):4:10
    9. Tire Size (ex; 245/75 R16):235/85 R16E
    10. Tread style; Offroad, Mud/Snow, Highway:highway
    11. Gear vendor? (if so, od/ud ratio and how you use it):no
    12. Boost control; Mechanical/Electrical:mechanical
    13. Boost pressure setting (4-20lbs):12
    14. Manual/Automatic Trans:auto
    15. Thermostat (160, 180, 190, 195, 205, 215, none):195
    16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):Heath 2.0
    17. Timing Gear Y/N:n
    18. Intercoooled Y/N:n but i need one bad.
    19. Mist injection Y/N:n
    20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter):stock with airbox mods, unifilter
    21. EGR/Non EGR:non egr
    22. GM Turbo Style (GM5,6,8, other):5
    23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other):4", no kitty
    24. TDC offset set to (stock, or the value you have it set to):-1.47
    25. Stock injectors/High pop:stock
    26. Synthetic oil Y/N:next oil change goes in the Amsoil
    27. Highway mileage (not towing, best averaged over 3 tanks):15.207
    28. When mileage data was obtained (Winter, Summer): summer
    29. Approx miles on vehicle:124K

    Once i reach 20 responses, i'll put out some data.

    Thanks for taking the time to asnwer

  15. #15
    Join Date
    May 2005
    Location
    SE Wisconsin
    Posts
    488

    Default

    1. Truck Extended Cab Long Bed
    2. 3500 dual rear wheels
    3. 4x4
    4. Driving Habits; 1
    5. Tune of vehicle; 3
    6. Amsoil Cetane boost (5 - 6 oz)or fuel modifier (16 oz) every other or every three tanks
    7. Size of fuel tank (Suburban is 42 gal): 30 - 32 ?
    8. Rear Gear Size (3.23, 3.55, 4.10, ect): 4.10
    9. Tire Size (ex; 245/75 R16): 235/85/R16
    10. Tread style; Offroad, Mud/Snow, Highway: All terrian Radials
    11. Gear vendor? (if so, od/ud ratio and how you use it):NONE
    12. Boost control: Mechanical
    13. Boost pressure setting (4-20lbs): 12 - 14 max
    14. Manual/Automatic Trans: 5 speed manual
    15. Thermostat (160, 180, 190, 195, 205, 215, none): 180
    16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):NONE
    17. Timing Gear Y/N:N
    18. Intercoooled Y/N:N
    19. Mist injection Y/N:N
    20. Air filter: stock 97 and newer box
    21. EGR/Non EGR: NON
    22. GM Turbo Style (GM5,6,8, other): GM3
    23. Exhaust : 3.5" to 4" w/ Donaldson Muffler, no cat
    24. TDC offset set to (stock, or the value you have it set to):-
    25. Stock injectors/High pop: Marine
    26. Synthetic oil Y/N: Y - Amsoil 15-40
    27. Highway mileage (not towing, best averaged over 3 tanks): avg. 19.5
    28. When mileage data was obtained (Winter, Summer): Summer
    29. Approx miles on vehicle:252k on truck, 10k on engine
    1993 K3500 - Peninsular 18:1 engine, marine injectors, high capacity cooling, AL Core Radiator, 3" DP and 4" exhaust, ISSPRO Gauges, Girdle, AMSOIL Dual Oil Filter System, 1997 Air Filter(trashed the K&N), 395K on Body, 165k on engine.
    1997 GMC Savana - 6.5 TD
    1966 CJ5 - V6 Gas - highly modified
    1967 Jeepster - Stock
    1986 Jeep CJ7 - Stock
    1993 Grand Cherokee - 6.2 diesel
    2007 Grand Cherokee - 3.0 diesel

  16. #16
    Join Date
    Jun 2002
    Location
    NY
    Posts
    131

    Red face

    1. What model do you drive Suburban
    2. Level 2500
    3. 4x4
    4. Driving Habits; 3
    5. Tune of vehicle; 3
    6. Fuel additive added every fillup in OZ; none:
    7. Size of fuel tank (Suburban is 42 gal):
    8. Rear Gear Size 3.23
    9. Tire Size (ex; 245/75 R16):
    10. Tread style; Highway:
    11. Gear vendor? no
    12. Boost control;Stock
    13. Boost pressure setting Stock
    14. Automatic Trans:
    15. Thermostat 180
    16. PCM programming none
    17. Timing Gear N:
    18. Intercoooled N:
    19. Mist injection N:
    20. Air filter stock
    21. EGR
    22. GM Turbo Style (GM5,6,8, other):
    23. Exhaust Stock
    24. TDC offset set to stock
    25. Stock injectors
    26. Synthetic oil N:
    27. Highway mileage 17
    28. When mileage data was obtained Spring
    29. Approx miles on vehicle:115,000
    30.
    America Love it or Leave!
    1999 Cheverolet K2500 Suburban 4X4 LT
    Hybrid Diesel/Vegetable Oil conversion by me
    In Memory of My Fallen FDNY Brothers
    Never forget Never Forgive

  17. #17
    Join Date
    Apr 2005
    Location
    Shelby TWP, MI
    Posts
    31

    Default

    1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify): 2001 GMC SAVANA WORK VAN w/ weatherguard shelving and stocked full of plumbing supplies approx. everyday weight 8900lbs
    2. Level 1500, 2500, 3500, 3500 dual rear wheels: 3500
    3. 4x4 or 2x4: 2x4
    4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:5
    5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor:3
    6. Fuel additive added every fillup in OZ; number or none: Lucas 4oz./or none No measurable difference
    7. Size of fuel tank (Suburban is 42 gal):28.5
    8. Rear Gear Size (3.23, 3.55, 4.10, ect):3.73 limited slip
    9. Tire Size (ex; 245/75 R16): 245/75 R16
    10. Tread style; Offroad, Mud/Snow, Highway: Highway
    11. Gear vendor? (if so, od/ud ratio and how you use it): None
    12. Boost control; Mechanical/Electrical: Factory
    13. Boost pressure setting (4-20lbs): factory
    14. Manual/Automatic Trans: Auto
    15. Thermostat (160, 180, 190, 195, 205, 215, none): factory, temp guage always reads 155 and 170 when hills or towing in hot climate
    16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): Factory
    17. Timing Gear Y/N: STOCK
    18. Intercoooled Y/N: STOCK
    19. Mist injection Y/N: STOCK
    20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter): STOCK AIRBOX ,WITH AMSOIL FILTER, big improvement on turbo lag and eliminated any of the very little black smoke
    21. EGR/Non EGR: 2001 STOCK
    22. GM Turbo Style (GM5,6,8, other): 2001 STOCK
    23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other) STOCK
    24. TDC offset set to (stock, or the value you have it set to):STOCK
    25. Stock injectors/High pop: STOCK
    26. Synthetic oil Y/N: YES, AMSOIL 5w-40 diesel Series 3000, eliminated the need for block heater, starting was just a tap away
    27. Highway mileage (not towing, best averaged over 3 tanks): 15.8 stocked (70 or 80 mph)and 17.2 completely empty@80mph and 19.1 @ 70mph
    28. When mileage data was obtained (Winter, Summer): Summer/ Winter is exactly .5-.7mpg less in all above conditions
    29. Approx miles on vehicle:156K

    Sorry for the incomplete info but the van has never been wrenched on and I don't know the factory info. Are those above posted add-ons really helping MPG that much ? Are there add-ons I SHOULD be doing that will make big improvements, most of what I researched seemed to be a trade off for improvement. Wether it was worth working on and cost VS. the measurable improvement. You know these vans are tighter than you know what to wrench on. Thanks for the poll. If anyone can shed some light, just PM me , I don't wanna hijack this thread. Thanks
    Last edited by PLUMMER; 05-19-2006 at 07:18.

  18. #18
    Join Date
    Sep 2001
    Location
    Lubbock TX, USA
    Posts
    4,194

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    Did I miss something, but what is or when are we going to see some results?

  19. #19
    Join Date
    Oct 2003
    Location
    Maine
    Posts
    642

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    Quote Originally Posted by john8662
    Did I miss something, but what is or when are we going to see some results?
    You havent. I was hoping to get 20 responses before I put something out. I have most of the data computed. I'll give it another week. If I cant get the desired responses, i'll put out some info.

    In the meanwhile, everyone that hasn't posted, please post.

  20. #20
    Join Date
    Jan 2005
    Location
    Plymouth, MN
    Posts
    137

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    --------------------------------------------------------------------------------

    1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify): 1994 pickup shortbed extended cab empty load
    2. Level 1500
    3. 4x4
    4. Driving Habits; 2
    5. Tune of vehicle; 3
    6. Fuel additive added every fillup in OZ; PS 4 oz's
    7. Size of fuel tank 25 Gal.
    8. Rear Gear Size (3.23, 3.55, 4.10, ect):3.73
    9. Tire Size (ex; 245/75 R16): 245/75 R16
    10. Tread style; Mud/Snow
    11. Gear vendor? (if so, od/ud ratio and how you use it): None
    12. Boost control; Mechanical/Electrical: Factory
    13. Boost pressure setting (4-20lbs): factory
    14. Manual/Automatic Trans: Auto
    15. Thermostat (160, 180, 190, 195, 205, 215, none): 195
    16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): Factory
    17. Timing Gear Y/N: STOCK
    18. Intercoooled Y/N: STOCK
    19. Mist injection Y/N: STOCK
    20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter): STOCK AIRBOX with hole cut in the top of the box.
    21. EGR/Non EGR: Non EGR 1 ton intake manifold
    22. GM Turbo Style (GM5,6,8, other): 1994 STOCK
    23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other) STOCK
    24. TDC offset set to (stock, or the value you have it set to):STOCK? don't know, rattles really loud at idle
    25. Stock injectors/High pop: STOCK
    26. Synthetic oil Y/N: YES, Rotella 5W-40
    27. Highway mileage (not towing, best averaged over 3 tanks): 19.5MPG @ 75MPH, 21.2MPG @ 65MPH, 16.5MPG average city
    28. When mileage data was obtained (Winter, Summer): Summer/ Winter is aprox. 2MPG less in all above conditions
    29. Approx miles on vehicle:200K
    1994 Chevy 6.5TD 1500 Z71 4X4 Extended Cab Short Box Pickup, 3.73 gears & FSD cooler 5W-40 Rotella - I rebuild Snowmobile shocks WWW.shock-service.com

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