View Poll Results: Your 6.5 highway fuel milage?

Voters
562. You may not vote on this poll
  • less than 12 MPG

    7 1.25%
  • 12-13 MPG

    28 4.98%
  • 14-15 MPG

    72 12.81%
  • 16-17 MPG

    133 23.67%
  • 18-19 MPG

    107 19.04%
  • 20-21 MPG

    64 11.39%
  • better than 21 MPG

    49 8.72%
  • Just looking

    102 18.15%
Page 2 of 3 FirstFirst 123 LastLast
Results 21 to 40 of 60

Thread: 6.5TD MPG Hiway mileage Poll!

  1. #21
    16gaSxS is offline Moderator, Have Shotgun & dogs will travel
    Join Date
    May 2002
    Location
    Great Falls, MT
    Posts
    1,014

    Default

    Quote Originally Posted by Michael Cain
    Were sorry to hear that you are in canada vote to become the 52nd state JK.

    This one has me perplexed?
    But I am confuse easlie.
    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

  2. #22
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Question

    Uhhhh. Yeah.....

  3. #23
    Join Date
    Aug 2006
    Location
    WV
    Posts
    56

    Default

    Quote Originally Posted by 16ga SxS
    This one has me perplexed?
    But I am confuse easlie.
    I think that they are counting Iraq as the 51st state....I Guess
    Shane

  4. #24
    Join Date
    Sep 2006
    Location
    Brooker, FL
    Posts
    1,217

    Default

    Well, I get about 9.8 mpg, but then my 6.5L TD is in an 18,000 lb. class A motorhome.

  5. #25
    Join Date
    Jun 2006
    Location
    Okanagan BC, Canada
    Posts
    66

    Default

    I have a 93 2500 extended cab long box, 2 wheel drive, 4l80e trans, 3.42 gears non posi full floater rearend, tires are 265/75 16 ltx michelins, F engine, original pump and injectors with 170,000 miles. Its getting 20mpg on the US gal.

  6. #26
    Join Date
    Dec 2006
    Location
    NJ
    Posts
    157

    Default

    I looked at this thread briefly, I have a couple questions. I'm running a stock 95 GMC Sierra 6.5L Turbo diesel ext cab 6ft bed automatic trans with 152K miles and my truck rides on 315/70/17 in tires with completely stock gears to my knowledge. Normally In town I get about 11-12 miles to the gallon and I have mainly stop and go and some highway, mostly on and off the brakes. I do a little better on the highway, but not a whole load, maybe 2 mpg better. What is the standard PSI that these truck's turbos push.? I don't know as I just found the wastegate actuator on mine is shot and was wired shut so it would boost. I have no Idea of the specs on these trucks. My truck the way it was would pull up to 13 psi normally on the highway depending on hills and normally driving anywheres from 5-11psi. If i stomped it I would pull well over 15Psi as the little boost gauge thats installed that is a 15psi gauge will go past and start going around again. I got a lot of questions, but need to start getting some answers for at least a baseline, maybe this thing is out of wack thats why my MPG sucks.
    95 GMC Sierra 2500 4x4 6.5L turbo ext cab 6ft bed ( relocated NEW PMD with cooler, running so far so good) SOLD SOLD SOLD

    95 Chevy Silverado 1500 4x4 Z71 stepside 350V8

  7. #27
    Join Date
    Oct 2003
    Location
    Summerville, S.C.
    Posts
    1

    Cool Mpg

    My MPG averages 14.8

    _________________________
    95 3500 ext cab,K&N air filter
    no other mods

  8. #28
    Join Date
    Dec 2006
    Location
    Absarokee, Montana
    Posts
    8

    Default Mileage - 93 GMC 6.5 Turbo Diesel


    I have a 93 GMC 6.5 Turbo Diesel with a 5 speed manual transmission and I use the criuse control. This is an extended cab pick up approaching 70K miles.

    This is my first diesel vehicle and I am learning the ropes and I really like driving this truck. I live in Montana and it makes going from point A to point B quite pleasant since these points can be very far apart.

    On a recent trip to Minnesota in January, I average 24 mpg. I did have a tail wind that helped and I was traveling light. I normally average better than 20 mph.

    I check my mileage at every fill up, so my mileage records have a good track history. I will see in better detail how things shape up when it warms up. So far winter weather has not slowed me down too much.

    I enjoy this website and bulletin board. Keep up the good work; all the best.

    GMC-RKL

  9. #29
    Join Date
    Dec 2006
    Location
    Absarokee, Montana
    Posts
    8

    Default Tire Size Can Make a difference too.


    I had original rubber on my truck when I received it. The tires quickly played out as I started driving it over Montana gravel roads.

    I replaced the old tires with Cooper 235/85 R16 10 ply. They are taller tires. Over 100 measured miles the odometer is reading about 95 miles traveled. I would imagine I am rolling faster than my speedometer indicates as well. But in Montana the Interstate speed limit is 75 mph. I ususally do not go that fast.

    So, if I could have an accurate measure of miles traveled I might be getting even better mileage than I calculate.

    My truck runs like a dream at 1800 rpm in 5th gear going about 65 mph, and I fit comfortably in it to boot. Happy driving.

    RKL

  10. #30
    Join Date
    Jun 2006
    Posts
    31

    Default

    93 MECHANICAL ext cab long bos 5sp 4x4. Put on the cold air intake, 3in down pipe and 4in exhaust and get 18.5mpg. Have 4:10's
    93 chevy ext cab long box,
    6.5 turbo diesel-4x4-5sp manual.
    186k miles. Cold air intake,
    4in exhaust.

  11. #31
    Join Date
    Apr 2007
    Location
    West Michigan
    Posts
    7

    Default

    19 to 21 given the following makeup and variables at approx. 70mph

    Stock 6.5, 4L80-E, 4.10 gears, Stock size tire

    1. 1996 Chevy Suburban
    2. 2500 2wd
    3. Fuel Additive: PSP @ .45 oz/gal
    4. Condition of vehicle: Fair
    5. Driving habits: Conservative
    6. Thermostat: 195
    7. Overall rear gearing: 4.10
    8. Stock Air Filter
    9. Intercooler: None
    10. ECM Boost Control
    11. Stock PCM
    12. Exhaust: stock

    True Americans - Patiently waiting for the poison shrub to burn out.
    Last edited by dawghauler; 04-15-2007 at 10:18.

  12. #32

    Default Has that shrub burned out yet? Soon I hope.

    I'm getting about the same mileage,
    100000 miles on truck
    1995 4x4, K2500
    Stock with a FSD cooler
    and straight through 3" exhaust.
    I plan on putting a 40 horse chip in and am wondering what that'll do to my mileage. Also will be installing after market intake filter (cone style) I want to hear the turbo whine.
    Right now I get 18/20 MPG at 1900 RPM which is about 61MPH.
    Anything over 2000RPM and the gauge drops proportionally.
    What I don't understand is how can a person with a lifted new 4x4, oh let's say a Ford F350 Crew cab just for kicks with a diesel can haul down the freeway at 80MPH and not be in the poor house. I see it all the time.
    I've got a good job make good money, these guys must be running the credit up at the gas station.

  13. #33
    Join Date
    Sep 2006
    Location
    Brooker, FL
    Posts
    1,217

    Default

    Quote Originally Posted by rustyk
    Well, I get about 9.8 mpg, but then my 6.5L TD is in an 18,000 lb. class A motorhome.
    Things do change - with my replacement Peninsular Diesel AMG 230 HP (custom spec'ed) 6.5L TD, mileage is nearly 11 mpg...
    '94 Barth 28' Breakaway M/H ("StaRV II") diesel pusher: Spartan chassis, aluminum birdcage construction. Peninsular/AMG 6.5L TD (230HP), 18:1, Phazer, non-wastgated turbo, hi-pop injectors, 4L80E (Sun Coast TC & rebuild, M-H Pan), Dana 80 (M-H Cover), Fluidampr, EGT, trans temp, boost gage. Honda EV-4010 gaso genset, furnace, roof air, stove, microwave/convection, 2-dr. 3-way reefer. KVH R5SL Satellite. Cruises 2, sleeps 4, carries 6, and parties 8 (parties 12 - tested).

    Stand-ins are an '02 Cadillac Escalade AWD 6.0L and an '06 Toyota Sienna Limited.

  14. #34
    Join Date
    Nov 2001
    Location
    Aitkin, MN
    Posts
    1,986

    Default

    Good Day!

    I hope you're not unaware of it, but going from 9.8 mpg to 10.8 saves you ~ 1 gallon per 100 miles. Do the math: at today's fuel prices, that's a significant savings.

    Blessings!
    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

  15. #35

    Default

    18 MPG. That's not bad for a tank.
    94 Silverado 6.5TD Crew Cab DRW
    7" Fabtech Lift / 33" Mud Terrains
    SSDiesel Cold Air Intake and Exhaust

  16. #36
    Join Date
    Aug 2006
    Location
    California
    Posts
    7

    Default

    Freeway: 13 to 14 mpg cruising at 75 mph.

    City: 12 to 13 I think my dear wife likes to hear the diesel roar as she leaves the stops. :-)

    4.10 rear end
    Automatic trans.

    Steve
    The Family Truckster is:
    1996 6.5L TD K2500 4x4 Suburban
    Stock except for:
    - Nerf bars
    - FSD Cooler mounted remotely
    Summer '07: 180K miles and going onto my fifth injection pump (first one I've had to pay for)

  17. #37
    Join Date
    Oct 2007
    Location
    Gridley, CA
    Posts
    175

    Default

    I have a 94 with 152,000 miles on it with no motor work. The truck is an ext. cab long bed, 3/4 ton with 3.73 gears. Everything is stock except a Heath Diesel lift pump. On freeway I get an average of 22 mpg and in town/highway i get an average of 17-19 mpg.

  18. #38

    Default 94 6.5 Fabtech Lift

    To "dually0815".........Youre truck looks awesme,was wondering if i could get a few pics emailed?Just purchased exact truck and would like to do the exact lift and size tires..Good Looking Truck!!! Thanks, urcableguy@hotmail.com

  19. #39
    Join Date
    Oct 2007
    Location
    Lansing,Michigan
    Posts
    1

    Default My 2 cents on mileage

    1997 Suburban
    1500 1/2 Ton (snicker snicker)
    6.5L factory engine NO mods
    3.42 gears
    42 gallon tank
    150,000 miles
    highway 24mpg @ 65mph
    city 15 - 18mpg depending on season

    Not bad for something that weighs as much as a semi

  20. #40
    Join Date
    Jul 2003
    Location
    Broadview, MT
    Posts
    98

    Default

    gets 16-18, doesnt matter if it is in the city, on the highway, pulling, towning, loaded, i hauled a 450 gallon water tank all summer, avg. 16.4, 4.10 gears, but I only drive the truck 63 mph, on the freeway i go 70.
    94' GMC K2500HD, Heath chip, -1.94, Turbo-Master, AFE Cold Air Intake, Bosch High Flow Injectors, 3" Exhaust all the way back, 4.5" chrome tip(exhaust sounds sweet), Heath Turbo Down Pipe, Heath Crossover, IssPro gauges, Three Pod Piller, 98' Cooling Mods, DMax Fan, High output water pump, DSG Oil Cooler, Heath PMD kit, Light kit with high output bulbs(very bright...finally)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •