6.5 TD Highway Mileage Poll by GMC Hauler

Since I've repowered StaRV II with a new AMG engine, things have changed, so I'm revising. Old numbers in italics:


Everybody's got something so, so, NORMAL...


1. '94 Barth ["What the HELL is that?"] 28' Breakaway Class A motorhome
2. 8500? (I dunno, it has a GVW of 18K lbs.)
3. 4x6
4. 1 (As if there's anything else as an option)
5. 1
6. Injector cleaner and lubricity additive for USLD
7. 40
8. Dana 80 4.53 (I think - Mag-Hytec cover installed)
9. 8x19.5
10. Mixed
11. Gear vendor? Nope - no room and unnecessary
12. Boost control: Non-wastegated turbo - 12 psig max (Purely Stock)
13. Same as 12.
14. Automatic Trans 4L80E (Mag-HyTec pan installed)
15. Thermostat: 2x180F stock with new mill (Kennedy Diesel kit installed)
16. N/A - DB-2
17. Timing Gear: Phazer (N)
18. Intercooled: N
19. Mist injection: N/A
20. Air filter: Stock Wix, but this diesel pusher has far less restrictions - "Snorkle" is 4"
21. Non-EGR
22. GM Turbo Style: Peninsular Diesel Supplied
23. Exhaust: 4" Turbo to ground
24. TDC offset set to : Stock
25. Hi-Pop Injectors (Stock injectors)
26. Synthetic oil: N Total waste of money (I'm a former fuels and lube engineer)
27. Highway mileage: 11.0+ mpg (9.8 mpg)
28. When mileage data was obtained: Winter (Summer)
29. Approx miles on vehicle: 56,400 (52,500)

1. 1980 Olds Cutlass
2. 1/8 Ton
3. RWD
4. Driving Habits; 2
5. Tune of vehicle; 3
6. Fuel additive added every fillup in OZ; 2-Cycle Oil
7. Size of fuel tank (Suburban is 42 gal): 18 Gallons
8. Rear Gear Size (3.23, 3.55, 4.10, ect): 3.30
9. Tire Size (ex; 245/75 R16): 255/60R15
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: NA
13. Boost pressure setting (4-20lbs):
14. Manual/Automatic Trans: 700R4
15. Thermostat (160, 180, 190, 195, 205, 215, none): 180
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): Kennedy DB2
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): Factory
21. EGR/Non EGR: EGR Blocked
22. GM Turbo Style (GM5,6,8, other):
23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other) Dual 2.25" straight pipes
24. TDC offset set to (stock, or the value you have it set to): By ear
25. Stock injectors/High pop: New stock
26. Synthetic oil Y/N: 5w-40 Rotella
27. Highway mileage (not towing, best averaged over 3 tanks): 30.1 Best, 27-29 Average
28. When mileage data was obtained (Winter, Summer):
29. Approx miles on vehicle: A zillion! Needs timing chain BAD!

Quote:

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Originally Posted by Michael Cain

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.

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31. 45 mi/gal with my veggie conversion
32. 20K miles on conversion