GM getting better mileage - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 26 (permalink) Old 02-25-2008, 01:39 AM Thread Starter
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GM getting better mileage

I have just gotten off the phone with the original owner of my 96' 250 and he had bought a chevy duramax. He said that he couldnt even believe it but he was getting 20 mpg empty on the highway and dosent even have 4000 mi on it. I am like WHATTTT?????
He also said that he never got any better than 18 with the 7.3.
I posted this here because of the possible relevence toward the poor mileage I get with my 08' I think Ford needs to look into some changes as well as the aftermarket. Not just for power but mileage. Anyone agree??
:mafia

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2008 F-350 crew cab short bed Lariat 4x4 6.4 with 3.73's Spartan flash update 250 210 175 150, S&B intake, MBRP cool duals, Rockford amps, Infinity speakers, Tuff Tonneau,
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post #2 of 26 (permalink) Old 02-25-2008, 10:50 AM Thread Starter
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TTTT, I see:sofa

Thad Seybert
2008 F-350 crew cab short bed Lariat 4x4 6.4 with 3.73's Spartan flash update 250 210 175 150, S&B intake, MBRP cool duals, Rockford amps, Infinity speakers, Tuff Tonneau,
1996 F-250 extended cab short bed 4x4 7.3 5-spd with 3.55's , DIY STG 1's, 4" Diamond Eye duals, DIY Intake, dp tuner, Cobalt gauges, Adrenaline pump, SD springs, D66 turbo, 6.0 intercooler, Custom electric regulated fuel system, Truetrac.
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post #3 of 26 (permalink) Old 02-25-2008, 10:53 AM
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From what I've read here about poor mileage and excess fuel in the oil on the 6.4, I wonder if Ford should revise their DPF programming to allow for less regen time, or less fuel needed for a regen?

I hope Ford isnt going to stubbornly refuse to address these issues with their customers.
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post #4 of 26 (permalink) Old 02-25-2008, 12:30 PM
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If you go into the GM area of this site you will see that they are having the same fuel milage problems that Ford is. Your buddy must have gotten a good one to get that type of milage.
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post #5 of 26 (permalink) Old 02-25-2008, 12:32 PM
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I don't think GM is suffering as bad in fuel economy as Ford. I'm reading more complaints from Ford owners than GM. There's a lot more sensitiviy to fuel mileage now that diesel is rolling up on $4/gal. Years ago, only a fuel fuel economy nerds cared, now we all care.

IMO, it's all about weight & aerodynamics between Ford & GM. The Fords sit nose-higher than GM creating more drag and they weigh a good 500+ more lbs per truck compared to GM.

It all adds up guys.
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post #6 of 26 (permalink) Old 02-25-2008, 12:35 PM
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Fuel Mileage

I am getting around 18mpg with mine, no problems/issues at all 2000 miles!

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post #7 of 26 (permalink) Old 02-25-2008, 12:44 PM
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He said this fella bought a Duramax...he didnt say what year. It quite likely is pre DPF. I have an 07.5 and it does get a bit better mileage than my 08 F350...but it simply doesnt handle the trailer like the Super Duty.

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post #8 of 26 (permalink) Old 02-25-2008, 12:48 PM
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Quote:
I have an 07.5 and it does get a bit better mileage than my 08 F350...but it simply doesnt handle the trailer like the Super Duty.
One wouldn't think a 2500 would handle a trailer like a 350. A 350 will have bigger spring packs and possibly a thicker sway bar. A 350 also has beefier rear tires.

Pre DPF trucks get better fuel mileage than DPF trucks for sure, but from what I'm reading, DPF GM owners seem to be averaging better fuel economy than DPF Ford owners.
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post #9 of 26 (permalink) Old 02-25-2008, 12:53 PM
 
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I'm guessing poor mpg is directly related to the stock calibration. After reading about the very impressive mpg increase from guys with removed DPF's and a recalibrated PCM with no regen process that leaves me to believe that regeneration process is the culprit.
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post #10 of 26 (permalink) Old 02-25-2008, 01:31 PM
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Wonder how long it will take Ford to realize this and give us a recalibrated regen process?

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