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Old 01-11-2011, 09:38 PM   #1
Orangepstroke
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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.
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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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Old 01-11-2011, 10:14 PM   #2
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It will make a difference in the fule mileage! Also my right foot makes a big impact on my mileage!
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Old 01-11-2011, 10:31 PM   #3
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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.
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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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Old 01-11-2011, 10:53 PM   #4
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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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Old 01-12-2011, 12:15 AM   #5
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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.

Garrett
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Old 01-12-2011, 12:24 AM   #6
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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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Old 01-12-2011, 02:19 AM   #7
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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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Old 01-12-2011, 03:50 PM   #8
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Does that pickup have 4.10s or 3.55s?
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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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Old 01-13-2011, 05:25 AM   #9
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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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Old 01-13-2011, 10:40 PM   #10
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Yeah it don't matter. If I'm towing haulin or empty. Same mileage. Tires, bearing, alinement, etc everythings good.
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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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