6.7 L Fuel economy - Dodge Cummins Diesel Forum
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post #1 of 79 (permalink) Old 07-23-2012, 04:57 PM Thread Starter
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6.7 L Fuel economy

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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post #2 of 79 (permalink) Old 07-23-2012, 05:04 PM
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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

2012 ram 3500 crew cab short box 4x4 ST 6sp manual
18x9 ultra bolts, 275/70R18, N-fab wheel to wheel 4 steps, stampede fender flares, stampede visors, weather tech floor mats... More to come
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post #3 of 79 (permalink) Old 07-23-2012, 05:04 PM
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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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post #4 of 79 (permalink) Old 07-23-2012, 06:47 PM
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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.

White 2012 Ram 2500 ST Crewcab, AT, 3.73s, Rough Country 5 inch lift, 22x12 Fuel Mavericks, 35x12.50 Toyo MT's, H&S XRT Pro programmer, MBRP 5" turbo back exhaust
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post #5 of 79 (permalink) Old 07-23-2012, 08:29 PM
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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.

2012 F150 Ecoboost

SOLD-2011.5 3500 SRW Mega HO 4wd Big Horn
Mini-Maxx w/ OD software, Flo-Pro DPF delete and downpipe, HIDs all around, Sinister EGR/Cooler delete,Console shift mod, GDP ladder bars
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post #6 of 79 (permalink) Old 07-23-2012, 09:08 PM
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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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post #7 of 79 (permalink) Old 07-23-2012, 09:39 PM Thread Starter
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Thanks for your replies.
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post #8 of 79 (permalink) Old 07-24-2012, 12:21 AM
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I get 26MPG at 80 with a 4"lift and 37's!!!

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

New Ride: 83 Crew Cab Short Bed 4x4 GMC p pump 12v swap in progress
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post #9 of 79 (permalink) Old 07-24-2012, 12:35 AM
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Straight 18 MPG, I am using the Bully Dog GT Tuner.
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post #10 of 79 (permalink) Old 07-24-2012, 02:26 AM
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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)
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.

SO..my dpf fell off today (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 NO ONE here is gonna believe that's an accurate number, and I'm sure it's not
LOL
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

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

but I'm aimin for 20

truck sounds BAD ***, got a little bit of drone around 2.1k might just annoy the hell outa me hehe :P

'12 6.7 HO 3.73's automatic, leveled, 35x12.50Toyo MTs, 20" monsters,
[DELETE] Sinister EGR/Cooler, CCV filter, CAT, DPF, muffler [/DELETE]
5" Diamond Eye TBE, 6" tip, h&s Mini Maxx, h&s OD trans tune.

Last edited by nvsbl; 07-24-2012 at 03:09 AM.
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post #11 of 79 (permalink) Old 07-24-2012, 02:59 AM
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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

2008 megacab, Twin pumps and a big single.
B&G Performance Diesel
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post #12 of 79 (permalink) Old 07-24-2012, 07:48 AM
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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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2011 Ram 3500 Laramie 4x4 SRW 6.7, Bully Dog GT, a few missing parts,4" TBE exhaust,turbo baffle delete, Kelley 315/70/R17 TSR tires/ stock rims, Reese 20K, Firestone 5K airbags,smoked tail and roof lights, Truck lite LED's,2" Daystar Level kit,Fleetguard filters, Mobil 1 Synthetic oil

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