finalwest

Well.... My studied opinion on this subject is minimal... However i can tell you what i know. My truck is a 5 speed with, 6in lift and 35in tires.... and i get 14 to 15 on the hwy and about 13 in town. Not that it matters because my truck is much lighter and a regular cab. But thats also the same mileage i got in it before i lifted it. I changed my gears out. That F250 model that you have was only sold for like 2 years right? It does have bigger axles right? i think 7 lugs? What size gears came stock in it? What size gears do you have in it now? Generally the stuff about putting bigger tires on it to get better mileage is hog wash. when you put bigger tires on you begin to loose torque and the proper gear ratio to turn them. "Skinnier" tires could possibly help because of the footprint the tires have on the road. As for driving in WINTER.... I could understand driving slower and dealing with snow and the slush... But if your winter driving is the same as your summers like mine is... You should get a little more power in the winter. COLD DENSE air has more oxygen in it which gives your engine a little more power. Thats the whole reason people get inter coolers on diesels.

Carcrazygts2

Curently averaging 16.4 with winter blend fuel and 4.10 gears and 33's.

Jacob.P93

I get 15-16 city in the summer and 12-13 city in the winter I guess from letting her warm up and the 500lbs in the back.

97' F250-LD

iTrader: (1)

My point is that it's 90% HIGHWAY driving with only 13 mpg. I know this thing weighs 6K with me in it which is pretty damn heavy but when others are getting 15+ in a similar rig I'm questioning why I'm not. If I drove around town all the time I'd understand it but out in the sticks it's all highway to get anywhere. To my knowledge the 250LD comes with bigger cooling, axles, heavier frame, bigger cooling, different tranny with extra cooling, and a load level system, basically everything to make an F150 a better tow rig (which it's great at btw) so of course it's gunna be greared higher and weigh more. Not sure what my gears are at now but most likely they're the stock ratio.

FordmanUGA

You're heavier running gear is why your MPGs are less than a similarly equipped F150. Just the nature of the beast. I often wish mine had the 7700 LD F250 running gear.

97' F250-LD

iTrader: (1)

Like I mentioned earlier, it used to get 15 regularly then gradually decreased over time. If it still get's 13 after everything is in top shape then I'm gunna have to get used to it. Until then I'll continue to persue better mileage as much as I can

FordmanUGA

Oh, my bad. I see now.

mawk

Try a top engine cleaner, maybe seafoam, bk, or other magic in a bottle. It could help restore some of that lost power.

Collin

Don't forget the guys getting the better mpgs are reg cabs or 2wd. Relax summer is coming

F-ReV

My truck is 4600lbs roughly and I'm only getting around 10mpg with my 5.4 so I would say you're not doing to bad for yourself.