JasonSmith

What tune? I have ran all of them from the stock DPF delete to the 310. They all yielded an average between 15-16 mpg combined city highway.
You must be lucky or my tires are killing it.
My bet is the tires.

Wildman_grafix

37" tires and 4" lift, killing the mileage,,,,,,,Nah

JasonSmith

Probably not. The tires alone are only 88lbs each. Then there are the wheels....and the extra 60 gallons of fuel and 500lbs of survey equipment & tools.

Quicksilver

that could be it lol, pretty much same as yours, all the stock to 310, preferred 275 best overall. Ran slightly larger terra grapplers, love those tires on the HD trucks, best ride and handling and still aggressive for offroad use. 60-65 was even better, but that's too slow for highways down here (actually yesterday was going 80 and was still getting passed on i-95 lol), 70-75 and getting usually 20mpg avg was great imo considering the crap mileage it got stock, city was horrible.

looking forward to seeing what the 6.7's do.... the turbo is what's said to be the limited factor b/c of how small it is. The 6.4's can make a sh!tload of power modded.

Jassman

On my 11 F250 swb with stock 275 65 R20 Michelons vs my 11 F350 lwb with the same tires and gearing was within .2-.3 mpg difference.. When I added 325 60 R20's on the F350...the mileage dropped 1.5 mpg.

Sydwayz

iTrader: (1)

Drove a 6.7L PSD for the first time today. Its the only Ford diesel that i can compare to my slightly modded 7.3L PSD when it comes to power and delivery.

If you have year heat set on a 6.7L, they appear to be the real deal. Perhaps pick up a 7.3L for a year or so until some 6.7Ls show up in the used market.

Jassman

they are reliable..I think the real deal.. the 11 250 is our hot shot truck..105k on her

TRL505

08 F450 w 4.88's. Best I have seen is 10MPG...that may have something to do with it weighing 12k....LOL.

I can get 6.5-7MPG grossing 28k running 65-70mph. Not too bad all things considered. Truck pulls hills like nothing is back there.

575cat

Eric get rid of the DPF and turn off all the emission crap , I have done 450s 350 s 550 s the 550 I did the truck weighs 13500 empty and getting 14 + empty and will roll the rear tires with ease .

prostock85

Joe.. Wait for the 6.7