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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 01-24-2015, 12:26 AM   #1 (permalink)
JC PAINT WORKZ
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2015 MPG w/6" Lift and 20" wheels/35" Tires

Not sure if this is correct area or in suspension subthread. Second I know the MPG has been beaten to death but not really seeing specific MPG's w/trucks lifted & wheels.

So what MPG are you seeing with 6" lift & 20" and 35"s

I'm seeing (with only 4500 miles on odo) around 10-12 city and 15-16 Highway.

Seems like its getting a little better with the more milage. Is this normal? I know your not going to get the best as you could as stock but didn't think it would be this low with lift/tires.

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Old 01-24-2015, 05:36 PM   #2 (permalink)
redwngr
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It also makes a huge difference how the truck is being driven. It's near impossible to compare accurately.

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Old 01-25-2015, 12:04 AM   #3 (permalink)
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One of the biggest factors with fuel economy is tread design of the tires. Aggressive or even some all terrain tires can cost between 2 and 3 mpgs. Tire weight also has a negative effect. The heavier the tire and wheel combo, the worse the mileage.

I have a buddy with a 2012 dodge/cummins, he has a set of 265/70r17 Cepek Fun Country Tires and his mileage has been between 14-15 on the highway. He just picked up a new set of take off tires and wheels and the tires are Firestone TransForce A/T (very mild tread) he has picked up a solid 2 mpg with just the change of tread design on his tires. He has also managed to get stuck numerous times due to the lack of traction. He will keep his Fun Countries for hunting and use the Firestones for mileage gains on the highway.
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Old 02-01-2015, 12:24 AM   #4 (permalink)
JOKERGERM
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I have been averaging about 15.5 50/50 mix city and hwy and I get on it a lot

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Old 02-02-2015, 12:29 PM   #5 (permalink)
NorCal2500HD
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Take stock truck MPG figures and knock 2-3MPG off for lift/tires. Done...
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Old 02-02-2015, 01:59 PM   #6 (permalink)
hd2nv
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what r they getting stock?

is the 2-3 less just putting lift n 35s on ?

or is that with programmer or efi live??

or do u have to do the exhaust etc delete?

sorry for asking but thinking of getting rid of my 08 with most everything done to it n 52000miles n gets i think good mileage n going to 2015

thanks in advance for info
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Old 02-06-2015, 01:22 PM   #7 (permalink)
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Lifted 6" on 295s I am getting 14.5-15.5 mpg per tank on my normal city commute which is roughly 65% freeway and 35% streets. I can easily see 16-19 mpg, without the regen once per tank. When I have a long weekend and I am doing errands around the hood and never getting much over 35-55 mph, it will drop to 12-13 mpg easily.

I did one 150 mile round trip on mostly flat highway at 70-75 mph and seen 19 mpg, when I had little traffic and no regen.

My best mileage seems to be around 68+/- mph, not towing on relatively flat terrain.

My towing mileage when towing my toyhauler at 11-13K pounds is horrible and I can only get 8 mpg, but I am typically towing on highways with some grades. However, I did a 500 mile tow with my 6+k boat (with five people and lots of personal gear) in mixed terrain at speeds of 60-75 mph at I got 12+ mpg, which I thought was pretty good.

My driving style is pretty normal, I don't baby it everywhere, but I don't rod the hell out of it either. I do like to do an occasional hard roll on, just clear out the pipes. I haven't seen much improvement with mileage at 12K, but it may have gotten a little better, but I believe that is due to colder winter air, not break in.

All of this is hand calculated and my DIC is now about .8 miles higher than it should be. While the tuner corrected some of the difference, it did not fix all of it. My DIC was nearly spot on for the first 2k miles before I lifted.

On average, I think I am getting about 1.5-2 mpg less than I did with my 2005 set up the same way. The bottom line, unless you delete, I think you are going to get less mileage than pre-emissions trucks. That being said, the increase HP, braking, handling, towing capacity, gadgets, air-conditioned seats, etc. is worth a little compromise.
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Last edited by AXE; 02-06-2015 at 01:32 PM.
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Old 02-08-2015, 01:33 AM   #8 (permalink)
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I'm always surprised that fuel mileage never increases with larger diameter tires. The larger tires mathematically reduces the gear ratio, (i.e. 3.90 to 3.73) yet the advantage is never realized. Even if the new tires/rims weigh an extra 75lbs. each, the 300lb. weight (4%) addition on a 7400lb. truck should be negligible. Yet, I see guys reporting 10% less fuel mileage.
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Old 02-08-2015, 10:23 PM   #9 (permalink)
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Too much increased rolling mass and larger contact patch on the tires. More wind drag due to higher profile and more exposure under the chassis too. I think if you could run a steady speed all the time, say 65 mph with no starts snd stops you would then experience some of the advantages of the gear ratio.
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Last edited by AXE; 02-08-2015 at 10:27 PM.
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Old 02-09-2015, 10:57 AM   #10 (permalink)
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Curious, what air pressure is everyone running in the big tires, 33s or 35s? Seems with the increased contact patch, more aggressive tread and "assumed" lower pressure the rolling resistance would be substantially greater.

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