I am in the debate to buy a F150 Fx4 or an F250 Fx4.

I know that the F250 series suck gas no matter what engine you choose to put in it but I like the look of the F250's better than the F150's.

My question is, has anyone in here done any modifications to their 5.4's or V10's to get better fuel economy on F-250's? (Exhaust, intake, tuners, e-fans, ect.) And if so, how much improvement did you get?

I would like to atleast get 15-16mpg on the highway if I could and 13-14 in the city

 

I doubt with any mods except for maybe gearing could the 3V 6.8L V10 get that kind of mileage - especially in the city (stop-n-go stuff). I mean you would need level ground and the lightest foot possible and this, of course, unloaded.

The F150 w/ 3V 5.4L might get to those #'s...

 

15 mpgs on the freeway is possibe without any mods, but 13-14 in the city is not going to happen with the v-10.

 

Oops...I stand corrected. Dirk and some others have reported some better numbers than my thinking.

My 'hwy' mileage at best has been around 13-14mpgs running a 4:30 rear at 70mph - flat lander cruisin' between Chicago and Holland, MI.

 

going to idaho we were getting a little over 15 mpgs doing 70 with cruise control. 4.10 rear with 315-70-17s.

 

I would be happy with 15 and above on highway w/ v-10!

Has anyone started making tuners for the new 3v V-10 or intakes/exhausts?

 

Maybe when I get the 305/70/18's my mileage will improve a bit. Stockers are 275/70/18. Who knows....

 

i didn't believe the computer so i calculated miles to gallons and the computer was a few tenths off.

 

i also drive like an old lady......

 

I do too.

 

my 5.4SD gets 10 no matter how I drive it. Dads V10 averages 13 consistantly. Personally, I would go diesel with out a doubt

 

Yeah, but why would you 'go diesel' in the 5.4L V8 or 6.8L V10. That kind of mod would have a terrible affect on these engines -

I know what you meant, but just had to......

 

My wife's V-10 Excursion could get 16 to 16.3 on the interstate in the summer with air, loaded, and cruise set without a problem. That was a 203, so not a 3 valve. If I know I'd get that out of a 3V V-10, I'd push the boss for one, but he refuses to get hit with a gas guzzler regardless of the savings in the engine cost. He says "No thank you, thatnks for your thoughts, but I'd prefer the diesel". Who am I to agrgue. Looks like another F-250 will be on order here shortly.

 

The newer diesels aren't much more fuel efficient that the fuel munchin' V10's - maybe about 3mpg or so more. Considering the price of diesel fuel these days...who knows...

But, yeah, the boss is the boss

 

This is true until you start hauling or towing something. Then the V10 mileage drops to below 10 MPG and the diesel barely changes mileage at all.