For those that have "lightened the load" of their 6.7 and decided to tune via the infamous GH tunes, what "actual" mpg's are you getting? I know some say that they drop the emissions weight and tune for better mpg's, however mine has been substantially worsened after tunes. I went from close to 20 with the extra hardware to now 14. I in no way "hotdog" the truck and drive very conservatively. Just curious what others are getting following their GH tune install and with what tune (i.e street, hot street, race, etc). Thanks in advance.
13 MPG running ReadyLift Leveling Kit and 35" Nitto Terra Grappler MT wrapped around stock wheels.
I noticed the same thing. Not to sound ignorant, but I care a lot more about the health of my truck than the MPG's...I sleep better at night knowing she's running healthy without *missions than dropping a few MPG's.
When I'm hungry for MPG's, I hop in my sister's Honda
~Wes
2016 F250 CCSB KR
Just passed over 1,111.1 miles and loving it!
I have an 11 crew cab and get 15- 16 in the winter and 16-18 in the summer (figured by hand). Deleted with x4 and gearhead tunes. Bought the truck deleted with different tunes in that almost smoked the trans. Talked to Mike at no limit and he set me up with gearhead. Even with the old tunes mpg was the same. Don't know what stock would be. Old owner swore the truck got 22 mpg because the computer said so. He would not believe me that the computer was not accurate.
A lot of the tuning has to do with shift points as well. For me I had to go back with Lars and have him edit the shift points. The way they came from them the trans wouldn't shift until around 2k rpm. And their tunes disable adaptive learning in the tcm so the trans shifting doesn't change. Keep in mind this is on a 6.4 and all of our power comes on right around 1700-2k rpm, but I have seen a number of 6.7s that have the shift points set up the same way with GH tunes.
Now, in the last year they may have changed their trans tuning but I would highly suggest that you call Matt or Lars and talk to them. They can and will revise tunes for you...
Kenz makes a great point about winter vs summer fuel. Definitely a difference.
On a different note My 6.4 seemed to be more fuel efficient but time will tell. True test will be on the highway during summer. Summertime (in the flat state of South Carolina) in my 6.4, I could cruise at 80 and still manage 18 mpg. Around town depending on my right foot I never got better than 15-16. No matter what. I imagine the 6.7 will get better with more break in and a fuel oil changes with summer fuel. Either way, like I said before, with fuel at less than $2/gallon and $2-5 less than a pint of beer, I think it's safe to say I didn't buy this truck for increased miles to the gallon.
But even on my 6.4 winter fuel only looses me 1-2 mpg, not from 20mpg down to 13...
Deleting a truck shouldn't kill the millage. The readout on the dash will be different however... So if you are going off that you really have no idea what has changed. You needed true hand calculated numbers over several tanks before then after.
My dash actually follows really close to what I calculate, and I do it every fill up. An average since the day I bought it is about 16. First couple months was higher...then I leveled and put 35s on it and it held dead steady at 16 avg since then (~30k miles).
Whatever it is when I do delete/tune is what it's gonna be, I won't go back to stock just to gain a couple mpgs back. I was just assuming (hoping) it would be better. If not oh well..
I tuned with a gearhead tune bought from NLF , tow file ,using a SCT x3 and the day after, the temp here dropped from the 50's to below freezing , I had the MPG screen all over the place on accel and decel from 8-9 cruise to 30-40 coasting down the hills ! the truck had pretty poor mpg and smoky cold starts , after a few tanks now my screen shows 17.8 and hand calculated is 16.5
I also removed the upper and lower intake and cleaned out an alarming amount of carbon deposited by the previous operating EGR - http://www.powerstroke.org/forum/ge...7-65-000-miles-pics-soot-intake-manifold.html
Just to show for comparison, not starting a "who's tuning is better" fight. Lost the heavy stuuf around March '15. PIP set on Level 2 Street. Did an "update" to 7.2, awaiting the V8 releases. Modded under the hood, exhaust is straight thru, all other running gear is stock. Driving mixed daily to/from work, then trips around town weekends on the regular. The graph below is ALL my fill ups since I started using Fuelly totaling close to 37k miles.
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