After a year and 42,000 miles, my f250 is now up to 17.5 mpg but I drive it very easy to get this mileage.

 

I got a 2000 with a 7.3 running a old plug in superchip and a k&n filter. Two weeks agoI drove the truck up north and back, I set the cruse on 72 and ran that speed all that was possible there was very little driving in town or idle time. The truck has a 4.10 gear in it which means I was cranking it about 2500 rpm. On the trip I got 16.8 mpg. NOW in saying that check this out, If I drive the truck around 60 mph on shorter trips where the speed limit is lowerim running it at 1900 rpm I can get 18.7mpg. All the advice I could dig up and what I have found make me keep the truck under 2000rpm. The old style plugin supership is set at 60hp & 120 torque and is not adjustable, its changes to the shift points and fuel air mixture have made the truck drive like a whole new machine.

 

We just purchased a 2008 F250 SD diesel. The mpg is terrible. On interstate we got high as 13 and low as 11 mpg.
I have complained to my salesman and e-mailed Ford Motor. Salesman response was to bring it in and they will check it
out and he hasn't had any other complaints like mine. Ford Mtr had a list of things to do such as not hauling weight, turn
off a/c, drive 55, don't idle, etc... I didn't buy this truck to ride hot, I didn't buy this truck to ride it around empty.
We have not put a chip in it, I don't know if it would make any difference or not. We currently have 4006 miles on this truck.
We also have a F250, 2002 that gets better mpg. When we first purchased the 2002 we drove it on a trip and got 17 mpg, it
doesn't get that now, it gets about 14. So you can't tell me that they have to be broken in to get better mpg. We drive
this truck the same way we do the other one, we do not baby it.
My husband said he was gonna paint a sign with a bright yellow lemon on it saying don't buy a F250 it gets bad mpg and
ride it around in the back of the truck! Has anyone come up with a solution or are you still getting poor mpg?

 

I am a pipeline welder and have a 08 f350 deisel crew cab with a welder and loaded down with tool box ansd everything needed for the job. I get 12 miles with that load and 10 with the load and pullig a 30 ft. camper. I was told if I put a chip in I could get an extra 5 miles to hte gallon. I am thinkig about doing it.

 

I have mine flash tuned to about 400 HP with a Diablo unit.. The beauty is,, that you usually get the extra ponies without any loss of MPG, but you may see 1-2 increase in MPG if you really behave and under the best of driving conditons, most being controlled speed, stop/go traffic, grades, altitude and of course loads.. 5,, very doubtful..