Average mileage? - Chevy and GMC Duramax Diesel Forum
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post #1 of 13 (permalink) Old 03-25-2011, 09:25 PM Thread Starter
 
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Average mileage?

Hey all,

I recently purchased a 2009 Chevy 2500HD Crew Cab with a Duramax. It has 25K miles on it. I was wondering what "normal" non-towing mileage should be. I do mostly county road driving (some stop and go but highway speeds(55mph)). I have been getting around 15.5MPG. Is that normal? High? Low?Thoughts? Thanks
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post #2 of 13 (permalink) Old 03-25-2011, 09:34 PM
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That sounds about like what I get with mine. What size tires are you running? I lost 3 mpg when I went to 285's from 265's. Is your truck stock?

07' LBZ Crew Cab
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post #3 of 13 (permalink) Old 03-25-2011, 09:36 PM
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I'm at 17.3 with 35's.

Jeff | 03 LB7 ECSB in Arrival Blue | 6" Fabtech | Tierods/Braces | Airaid Intake | 4" T.B/muffler delete | Profab Intake horn and D.P | Pump Rub Kit | BD Deep Pan | PPE B.V | EFI tuned by Mr. Coddens | AirdogII | Upgraded Sound | 20x10 MKW M26 | 35x12.50 Toyo M/T's | Bushwacker | 15% | All on Mod |
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post #4 of 13 (permalink) Old 03-26-2011, 08:44 PM Thread Starter
 
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Everything on the truck is stock with the exception of the air filter. I installed a K&N filter when I bought it. I did see an increase in the throttle response when I did that.
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post #5 of 13 (permalink) Old 03-26-2011, 08:46 PM
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on my 2011 w/ 3k miles i got 16 stock and 18 w/ my chip..


2011; 2500 LML Duramax, Z71.
Mods: aFe cold air intake, bully dog gt tuner, 6" fabtech lift kit, 20" fuel boost rims, 35" nitto mud grapplers, projector halo headlights, recon smoked led tail lights, rbp mesh grille, blacked out bowties, debaged completely, train horn, PA system, 2 10" kicker comp subs, cooler in the bed.

next: 5" flo pro straight pipe, xrt tuner. (dpf delete of course) color matched bumpers, mirrors, & handles.
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post #6 of 13 (permalink) Old 03-26-2011, 09:13 PM Thread Starter
 
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What chip did you intall?
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post #7 of 13 (permalink) Old 03-26-2011, 09:21 PM
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Quote:
Originally Posted by Rbrand View Post
Everything on the truck is stock with the exception of the air filter. I installed a K&N filter when I bought it. I did see an increase in the throttle response when I did that.
Oiled filter? Stock Intake?

Be careful not to over oil the filter, the oil gets on the MAF sensor and drops fuel mileage.

That said, mileage varies a lot on my 09 LMM. Depends where I fill up, driving conditions, etc.. Mileage between fuel stations varies up 2-5 mpg.
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post #8 of 13 (permalink) Old 03-26-2011, 09:56 PM
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Quote:
Originally Posted by Rbrand View Post
What chip did you intall?
i gotta bully dog pro gt tuner.


2011; 2500 LML Duramax, Z71.
Mods: aFe cold air intake, bully dog gt tuner, 6" fabtech lift kit, 20" fuel boost rims, 35" nitto mud grapplers, projector halo headlights, recon smoked led tail lights, rbp mesh grille, blacked out bowties, debaged completely, train horn, PA system, 2 10" kicker comp subs, cooler in the bed.

next: 5" flo pro straight pipe, xrt tuner. (dpf delete of course) color matched bumpers, mirrors, & handles.
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post #9 of 13 (permalink) Old 03-27-2011, 01:29 AM
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18-19 average, 22-24 highway with my 07 Classic LBZ using my custom ~400hp daily tune
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post #10 of 13 (permalink) Old 03-27-2011, 08:52 AM
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18-19 average, 22-24 highway with my 07 Classic LBZ using my custom ~400hp daily tune
Very similar mileage (check sig) on 265 tires. Gotta keep it at or below 2k rpms, though. And yes, that means going around 65mph or less on the freeway. I lose at least 3mpg on the freeway with 60-65 vs 70-75. Heavy truck + drag = exponential force to move it.

2004.5 GMC Sierra SLT EC 2500HD 4x4 LLY w/LBZ MP, PCV reroute, EGR blocked, 4" exhaust, PacBrake TR sleeves, DSP5 & EFI-Live w/Idaho Rob tunes
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