F250 5.4 fuel economy vs. 6.0

[bfloyd4445]

I've been using an 08 5.4 F250 the last month and the best fuel economy i can get even unloaded is 13.8mpg highway. On the highway my 07 6.0 always gets 18 to 22mpg at freeway speeds. I never realized how much better the fuel economy was with Diesel engines untill my experiance with this 08 superduty gasser.

[BigKid]

Yep! We run the 5.4 and a 6.0 here at work everyday, and the 6.0 always does better on fuel. The power of a diesel will spoil you as well. We keep ours loaded down most of the time. The 5.4 does between 8 - 10mpg. The 6.0 does between 12 - 14mpg.

[bfloyd4445]

Originally Posted by BigKid

Yep! We run the 5.4 and a 6.0 here at work everyday, and the 6.0 always does better on fuel. The power of a diesel will spoil you as well. We keep ours loaded down most of the time. The 5.4 does between 8 - 10mpg. The 6.0 does between 12 - 14mpg.

you do keep em loaded up to get that kinda mileage. I made a trip last summer in an F150 4.6L with 8,000 pounds of honey in 55 gallon drums on a trailer and averaged 12mpg. That trip was almost 550 miles and crosses two moutnin ranges. The 4.6 F150 got 17-18 at 70 empty. The new F150 is EPA rated at 21!

[IUStroker6.0]

5.4s aren't impressive in any aspect... i had an 01 and a couple of our 5.4s at work at 05s. terrible milage and power

[BigKid]

Originally Posted by bfloyd4445

you do keep em loaded up to get that kinda mileage. I made a trip last summer in an F150 4.6L with 8,000 pounds of honey in 55 gallon drums on a trailer and averaged 12mpg. That trip was almost 550 miles and crosses two moutnin ranges. The 4.6 F150 got 17-18 at 70 empty. The new F150 is EPA rated at 21!

Dunno about the F150s(4.6). But ya, our F250(5.4L) sucks some fuel.

If I could do it over again, we would buy another diesel. Ya fuel is higher, and oil changes cost more, but the difference in the milage would make up that cost over time.

[bfloyd4445]

Originally Posted by BigKid

Dunno about the F150s(4.6). But ya, our F250(5.4L) sucks some fuel.

If I could do it over again, we would buy another diesel. Ya fuel is higher, and oil changes cost more, but the difference in the milage would make up that cost over time.

I much preferr the solid feel of the diesel but the six grand saings for the 5.4 in todays world in which i am finding it hard to keep my head above water is awfully attractive. That is if i needed a new truck this year and i don't.

[cody1234567]

I have a 05 f250 CC with a 3'' lift and 36's with 20's, and I get 13.3 mpg on the highway. But I have a Programmer, Upgraded TB, KN Intake, Exhaust, with 3.73 gears. Thinking about going to 4.10's any idea of gas mileage decrease.

[bfloyd4445]

Originally Posted by cody1234567

I have a 05 f250 CC with a 3'' lift and 36's with 20's, and I get 13.3 mpg on the highway. But I have a Programmer, Upgraded TB, KN Intake, Exhaust, with 3.73 gears. Thinking about going to 4.10's any idea of gas mileage decrease.

is your mpg corrected for he tire size? You may see an increase in mpg with the 410's if you have tall tires and a lift which increases drag. My truck came from the factory with 20's, 373's, but no lift and i get 13.9 around town and 18 to 22 highway depending upon the speed unloaded.

[cody1234567]

Originally Posted by bfloyd4445

is your mpg corrected for he tire size? You may see an increase in mpg with the 410's if you have tall tires and a lift which increases drag. My truck came from the factory with 20's, 373's, but no lift and i get 13.9 around town and 18 to 22 highway depending upon the speed unloaded.

No it hasn't been recalibrated, I was wanting to try it out and see if it would make a difference.

[bfloyd4445]

Originally Posted by cody1234567

No it hasn't been recalibrated, I was wanting to try it out and see if it would make a difference.

what size tires do you have on your truck now? I've found easy calculators on the net before that allow one to quickly ascertain the corcted speed for any tire size gear ratio but can't remember any right now.