poor mileage - TheDieselGarage.com
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post #1 of 17 (permalink) Old 01-11-2011, 09:38 PM Thread Starter
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poor mileage

before i put in the imjectors, dv, turbos, timing, etc. i was only getting 15mpg. only mods were afc gutted and no plate. intake, exhaust, and gsk.
now im getting 14-15 mpg modded. why is the mileage so bad? is it cuz the afc isnt tuned. wouldnt think it would make that big of a difference just crusing down the highway.

Erik, 2001 psd 4x4 lariat ext cab pulling truck
Ts 140hp 6pos chip, 100hp split shots, stealth 2 pump,h2e turbo, tranny, afe stage 2,
5" exhaust turbo back, 10" stack, 3.9k mod on a switch, shimmed fpr,hx crossover hose, tc lock up switch. Custom weight rack and ladder bars, f550 springs, custom paint,5%+15% window tint, clear lights,custom billet grille, very big stereo, 20x10 moto meatals wrap with 33x13.50x20 ss iroks
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1996 2500 12v 2wd auto reg cab, flat bed, afc mods, sdx 140hp sticks, 4gsk, 60lbs springs, 191dv's, head studs, 16* timing, phat shaft 62/65/14 no plate, exhaust, intake, tanny, auto meter, adjustable overflow valve.

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post #2 of 17 (permalink) Old 01-11-2011, 10:14 PM
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It will make a difference in the fule mileage! Also my right foot makes a big impact on my mileage!

09 Dodge 2500 4X4 G56, not stock.
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post #3 of 17 (permalink) Old 01-11-2011, 10:31 PM Thread Starter
strokin now cummin later!
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i understand the right foot. but i usually have the crusie set at 75 on hwy get maybe 400 miles to a tank.

Erik, 2001 psd 4x4 lariat ext cab pulling truck
Ts 140hp 6pos chip, 100hp split shots, stealth 2 pump,h2e turbo, tranny, afe stage 2,
5" exhaust turbo back, 10" stack, 3.9k mod on a switch, shimmed fpr,hx crossover hose, tc lock up switch. Custom weight rack and ladder bars, f550 springs, custom paint,5%+15% window tint, clear lights,custom billet grille, very big stereo, 20x10 moto meatals wrap with 33x13.50x20 ss iroks
.


1996 2500 12v 2wd auto reg cab, flat bed, afc mods, sdx 140hp sticks, 4gsk, 60lbs springs, 191dv's, head studs, 16* timing, phat shaft 62/65/14 no plate, exhaust, intake, tanny, auto meter, adjustable overflow valve.

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post #4 of 17 (permalink) Old 01-11-2011, 10:53 PM
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might be the injectors???? not sure tho....... might bump your time a few more * and you might pick up some more mpg.....

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post #5 of 17 (permalink) Old 01-12-2011, 12:15 AM
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put the afc back together and tune it.

i was able to do 16-20 with 4.10s and dealing with L.A. traffic daily. i would do 500mi easily on a tank, did over 600 a few times as well.

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post #6 of 17 (permalink) Old 01-12-2011, 12:24 AM
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Dirty air filter?

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1995 12 valve Cummins 6.0L, Air Dog 150, no fuel plate, AFC tuning, 024 DV's, 4K GSK, 18* timing, SDX 5x.014 injectors, Hamilton 181/210 cam and HD pushrods, Stage 2 Port job, 5 angle valve job, 60lb valve springs, ARP studs, O-ringed head, .020" over head gasket, coated pistons, balanced bottom end, Fluidampr, PDI exhaust manifold, homemade intake manifold, HE351cw Common Rail turbo and 50mm wastegate.
Drive Train: 13" Valair clutch rated@600hp, 5 speed, 4x4, 3.55 diffs, on 285/75 R16s

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post #7 of 17 (permalink) Old 01-12-2011, 02:19 AM
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I think that I would start with the basics, tire pressure, tire rating E, are the brakes dragging, wheel bearings (temperature for balance to start), toe-in, wind drag... you started at 15, it should have been 20-21.

Six years ago I was driving a ton truck - the co had 2 the same - I made 16 mpg and the other made 9, we traded trucks and had the same results I made 16 with the truck that had been logging 9 and my truck made 9 with the other driver. It even made 16 when I put the Isuzu on a towbar to relocate, I took care to control windage with tarps and run easy. The other fellow drove comfortable - both feet on the floor when I rode with him.

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post #8 of 17 (permalink) Old 01-12-2011, 03:50 PM
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Does that pickup have 4.10s or 3.55s?

Logan
1995 12 valve Cummins 6.0L, Air Dog 150, no fuel plate, AFC tuning, 024 DV's, 4K GSK, 18* timing, SDX 5x.014 injectors, Hamilton 181/210 cam and HD pushrods, Stage 2 Port job, 5 angle valve job, 60lb valve springs, ARP studs, O-ringed head, .020" over head gasket, coated pistons, balanced bottom end, Fluidampr, PDI exhaust manifold, homemade intake manifold, HE351cw Common Rail turbo and 50mm wastegate.
Drive Train: 13" Valair clutch rated@600hp, 5 speed, 4x4, 3.55 diffs, on 285/75 R16s

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post #9 of 17 (permalink) Old 01-13-2011, 05:25 AM
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The flatbed is hurting your mileage. I lost 3-4 mpg putting one on my '97 dually.

Even with 4.10 gears, I got 16mpg stock with it. And nearly 18 after I modded it. Flatbed knocked me back to 12-15 range. Mostly 13-14, highway or not. No matter how I drove.

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post #10 of 17 (permalink) Old 01-13-2011, 10:40 PM Thread Starter
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Yeah it don't matter. If I'm towing haulin or empty. Same mileage. Tires, bearing, alinement, etc everythings good.

Erik, 2001 psd 4x4 lariat ext cab pulling truck
Ts 140hp 6pos chip, 100hp split shots, stealth 2 pump,h2e turbo, tranny, afe stage 2,
5" exhaust turbo back, 10" stack, 3.9k mod on a switch, shimmed fpr,hx crossover hose, tc lock up switch. Custom weight rack and ladder bars, f550 springs, custom paint,5%+15% window tint, clear lights,custom billet grille, very big stereo, 20x10 moto meatals wrap with 33x13.50x20 ss iroks
.


1996 2500 12v 2wd auto reg cab, flat bed, afc mods, sdx 140hp sticks, 4gsk, 60lbs springs, 191dv's, head studs, 16* timing, phat shaft 62/65/14 no plate, exhaust, intake, tanny, auto meter, adjustable overflow valve.

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