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I'm looking for some feedback on what type of fuel economy 6.7L owners are getting. Real world type of info, not dealer or manufacturer "suggested" efficiencies. Any info would be greatly appreciated. I presently own an 05' 5.9L and get in the high teens, and logic tells me bigger engine, less mileage. Thanks! Muck Aloha...
 

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Lie-O-meter in the dash is telling me 8mpg bombing around the city. Still on the first tank though. LOL
 

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Stock trucks are getting anywhere from 12-16 mpg. Deleted trucks typically see 3-4 mpg more. Mileage is very dependant on other variables however, driver, location, miles on the truck etc..
 

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I have an auto, 3.73 gears and the stock 31 inch tires. With 5000 miles on the odometer the dash is showing 15 to 16.4 MPG on the highway. This is unload and completely stock.
 

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I was getting 12mpg in town and around 17 highway, post deletes I get 15-16mpg in town and 20 highway.
 

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3500, crew cab, srw, 3.73, auto, no deletes. First tank I calculated at 12.9.

Certainly 1 fillup is not enough to get a good idea, but that fillup told me the computer was 1 mpg optimistic. Its probably more of a percentage than just 1 mpg, like my car which consistantly reads out 8% better than actual
 

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I get 26MPG at 80 with a 4"lift and 37's!!! :rof

But seriously before deletes I got 12.5 in town and 14.2-15 max on the highway never over 75mph

now its more like 14 around town and 17-18 mpg highway:thumbsup:
 

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Stock from the dealer I was able to get 13mpg city/hwy (after trading in my 5.9 that got 22HWY mpg's) :doh:
then I put on 35's and a 2 inch leveling kit and I averaged 10mpg HWY with just about 600lbs of tools on a 700 mile trip only stopping for fuel. :banghead::banghead:

SO..my dpf fell off today :shock:(thanks MPF!) and i will make the same 700 mile trip tomorrow.

but I can tell you from a 40 mile trip cruise set at 55 the EVIC showed me 25.5 mpg :shock: NO ONE here is gonna believe that's an accurate number, and I'm sure it's not
LOL :rof
That was yesterday with only the EGR deleted, now that the DPF is gone I've just been heavy throttle on mild around town, and its showin 16mpg :party018:

SO tomorrow i'll do the math on a couple tanks of fuel and report back!

but I'm aimin for 20 :thumbsup:

truck sounds BAD ***, got a little bit of drone around 2.1k might just annoy the hell outa me hehe :p
 
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About 80MPG on a blend of Unicorn piss and Dino jizz ;)

Seriously I get between 20-20.8 HWY and 15-16 in town if I keep my foot out of it, on 35x12.50x20's but it's pretty flat where I live also. 10.8 with a LOADED 40' gooseneck at 75 on the interstate
 

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When it was stock 14/16. With mods in my signature 18/21. Towing fifth wheel 12-13.8
 

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Last all highway trip @ the speed limit or 5 over 19mpg. Highway between 70-80 the whole way 16.8. Around town 14-15.5 depending on what I am doing. The above 19mpg trip was with 3 dudes in the truck each pushing 230 and a bed full of gear for 2 weeks.
 

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2011 3500 SRW 4:10s
315/70/17s
Mini Maxx with deletes
47,000 miles

Town 16/17
Hwy 19/21

Keeps improving as miles on truck increase.



Kelbo
 

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About 80MPG on a blend of Unicorn piss and Dino jizz ;)

Seriously I get between 20-20.8 HWY and 15-16 in town if I keep my foot out of it, on 35x12.50x20's but it's pretty flat where I live also. 10.8 with a LOADED 40' gooseneck at 75 on the interstate
I've got the dino jizz, but where the hell can I pick up unicorn piss? Think autozone would carry it?!?
 

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I see around 14.7-15.5 half city half hiway back and forth to work. 2012 mega cab 3.73's and 35's auto trans. Undeleted for now
 

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On the 2 lane highway going 50-55mph I get 19mpg, on the 4 lane at 63mph and get around 18. On the interstate running 78mph I get 16.5+mpg. I have 285/70/17 tires so that works out to around 32.5-33in and 373 gears. I just pulled an empty trailer at around 60mph for 40miles and then drove though town for a few miles. Empty it weights around 3500lbs I got 13mpg.

Cory
 

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2012 100% stock Mega with 3.73's
Still a new motor. only 2600 miles
13-15 in and around town. as low as 12 when I hit the lights wrong.
18-19 55-60mph on two lane
12+ Towing utility trailer loaded to appx 3500lbs on Interstate 75-80mph
 

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2011 3500 srw 3.73 G56 stock tires

Stock: 14ish town/hwy, 17-18 doing 60-65, 16-17 on the interstate
Towing: 3 horse slant trailer with full tack, 10.5mpg

Deleted H&S on mild:17ish town/hwy, 21-22 if i run 55-60, around 20-20.5 @ 65
Towing same trailer 12.5mpg on "no power level"
This is driving nice and easy
 
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