Have a 2015 F350 6.7 Powerstroke and as a leveling kit with 295 65-20 Toyo at2 extreme tires no other modifications my question is what should I be getting for mileage per gallon when I first got the truck I was getting 18 now I'm about 15 to 16 on put greatly appreciate it thank you..

 

Lots of variables here.
Highway vs. City?
if that is a mixed number how much is done on the highway?
Driving habits come into play as well.
Gears?
Here is a point of reference of mine.
2012 SRW 3.55 gears. Highway MPG at 75 MPH.
Bone Stock 17 MPG
4" lift with 35" tires 15 MPG
Deleted with the lift 22 MPG

 

3.55 gears in bone stock other than the leveling kit and the slightly bigger tires non deleted I'm wondering if I should take it back to the dealer and have them flash it again start from scratch? I'm just concerned with the aftermarket warranty on doing anything. Another question is do our trucks get better mileage at the higher speed because of the torque? Thank you again.

 

2016, F350 CCSB, 3.55s, leveled, 295/65/20s, 2wd front valence. 4' x 6.6' x 3/4" stall mat in the bed (~80 lbs). Averaging 14.5 mpg with mostly city driving. Unladen truck weight: 8,200 lbs.

 

Actually best mpg is below 65 mpg. RPMs are lowered and the amount of drag is less. These trucks have the aerodynamics of the broad side of a barn door, and the faster you go the worse the drag gets.

 

Winter Diesel and colder temps will have the effect on mileage that you described. I wouldn't worry too much about the mileage until winter Diesel is no longer being dispensed, and ambient temps stay above 60°. If your mileage is still lower than previously after those two things have happened, then you could be concerned.

 

I think your MPG is spot on, no need to worry.


Wow that deleted mpg is awesome.

 

I'd be way happy with that. Winter I've gone from 11 - 13.5. I'm 100% stock... In the summer same route, I'm in the 14-16 range. If I go on a long drive I can hit 18. Yeah, if I find that one straight 45 mph speed limit road, I can break 20 mpg, but it won't be my tank average.

FWIW, the IC Trip meters for me are spot on.

One thing hurting your highway mileage is that light bar or "sail".

If you haven't adjusted your IC to reflect your new tires size that also throws it off. Even hand calculating, since the # of miles you drive will be lower with bigger tires.

 

I ran 50,000 miles with the Toyo 295/65R20 A/T2 tires on my truck. It also had the 3.55 rear end and was leveled.

A good hiway drive, I might hit 18 mpg. Most of my driving was 15 Towing it's 10-11 mpg

I'd say your truck is right where it should be for mileage with those tires and lift.

 

I've been biting my tongue on this one. But Dak is 100% right. I was looking at roof racks for the wife's car to carry kayaks and all the eco greenies were bitching about a 1-2 mpg loss just with roof rack crossbars.

If you want mpg, remove the bigger tires, lightbar, and leveling kit. It's that simple. That said my dually will usually only get about 16 at best on the highway empty. But it easily weighs in at 9k and I can't do 65.

 

I must be lucky. My dually gets between 17.5-18.3 mpg regularly. That's combined average. When I tow, it's 10-12. I have 3.73 gears. It is a 2wd so that could be a factor. It's all stock as well.

My 06 averaged 16-17 with 4.10 and 2wd. It was bulletproofed.

 

better mpg going faster...

more rpms.. more fuel used.
driving an aerodynamic BRICK...
truck weighting 7,000 plus pounds.

I remember cars weighting 3,500 pounds and could not SEE 15 mpg.

 

That's pretty impressive, 22 MPG.

 

Thanks everyone, this is my personal diesel for the first time I just was not sure not to worry about the mileage because it is a truck a big truck and there are a few little goodies on it