Best Duramax year for mileage? - Chevy and GMC Duramax Diesel Forum
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Old 04-06-2011, 08:44 AM   eBay Motors  #1 (permalink)
 
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Best Duramax year for mileage?

Good morning - I'm looking into purchasing a Duramax as my next truck. Was curious if anybody had any insight as to which year/configuration typically kicks out the best fuel mileage - 2002? 2006? LLY/LBZ? 5 speed/6 speed? etc.. I realize that the rear end ratio is also key (3.73 being better than a 4.10). From what I've heard and read, it sound like with the right combo, you can get in the mid 20's. I'd definitely prefer that over low teens! Any insight would certainly be helpful. Thanks!
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Old 04-06-2011, 08:46 AM   eBay Motors  #2 (permalink)
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Well my LB7 gets better miledge than my friend's LLY. We basically have the same stuff.
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Old 04-06-2011, 08:52 AM   eBay Motors  #3 (permalink)
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Mid 20's, probably not going to get there.. low 20's are doable.
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Old 04-06-2011, 08:55 AM   eBay Motors  #4 (permalink)
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get about 22 mpg highway when im trying to do good...but its soooooo hard!
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Old 04-06-2011, 09:52 AM   eBay Motors  #5 (permalink)
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I don't think I could get mid 20's if I put the truck in neutral and pushed off a cliff. Best I ever got was 22 MPG running stock tires (265/70R17) at 70 mph on cruise and not towing. I can consistantly get 18-19 mpg on the highway when changing speeds and about 15 mpg for in town. If you put your foot in it often, then don't expect that kind of mileage.
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Old 04-06-2011, 09:58 AM   eBay Motors  #6 (permalink)
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stock 01-04 will be most fuel efficient but with a few mods youll be able to get just about any year to hit the same mileage, best real world mileage youre probably going to see is low 20s (personal best was 21.5 on 37s 70mph cruise control perfect driving conditions)
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Old 04-06-2011, 10:00 AM   eBay Motors  #7 (permalink)
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Im still toying with my tunes and cruising speed but ive done 21mpg with my LB7. Gotta be an old man though...
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Old 04-06-2011, 10:08 AM   eBay Motors  #8 (permalink)
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if you're concerned about MPG, a 7,000 pound truck might not be your best option.

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Old 04-06-2011, 10:10 AM   eBay Motors  #9 (permalink)
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personally the lb7 gets the best mileage of all of them Ive seen my lbz gets 13-18 and my buddys lmm gets 13 period but its bone stock
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Old 04-06-2011, 10:10 AM   eBay Motors  #10 (permalink)
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lb7's are better than everything! in every way!!
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