Theres too many factors, my engine is in near perfect condition just changed the plugs out and i get about 11.5 and much less in the winter. But I idle alot and have a lot of short trips and sometimes my truck dosnt warm all the way up. If you do a lot of highway driving or dont drive as hard or dont idle as much your v10 numbers could be better. Theres just no way to compare numbers that arent done close to the same way.

This is exactly right.
I know that I drive exactly the same as a good friend of mine that's nearby, our trucks are equipped almost exactly the same, we both feel the same about warmups,etc,etc..and his 5.4L truck is the same towing a similar load, and only 1-2 mpg better highway driving.
JL

about 1-2 sounds about right especially when were talking about ranges from 11-14mpg thats a difference of anywhere from 10-19% in fuel econonmy between the two motors.

I get about 12 mpg on the highway. I usually cruise between 75 and 85 mph.

11 city and 16 highway:-dancing1

2008, 5.4, 2 valve, E350 SD. Vancouver BC to L.A. 65-70, mostly 70 MPH.


13.5 MPG

(yes that's US gallons)

Hey I screwed up lesseon learned. I'll get the V-10 next time.

My 97 150 5.4 with 3.55 gears and 255X70X15 tires, 2wd gets 12-13 city full of tools and 17-18 hwy with 190K miles on it. But only 7-9 towing the horse trailer.
My 03 250 5.4 with 3.73 gears and 315X75X16 tires 4X4 gets 11-13 everywhere empty but 14-14.5 over 75 mph. But towing the same horse trailer gets 11-12, go figure.

I figured it would be less than the 150 but not that much.

Anyway next time it's a V-10 unless Ford makes a diesel I can work on without pulling the cab off, friggin idiots. I'm thinking about taking the 5.4 and trans out of the 250 and transplanting it into the 150 and put a Cummins in my 250 and send FORD the pics just piss them off.

Mikey

you get 14.5 and your complaining, thats the high end of what i get and I am not running 35 inch tires. I don't know how you can expect your 3/4 ton to get close to your half ton when your running wider, taller heavier tires on a 4x4 compared to a 4x2. Not to mention a super duty has a higher curb weight. Of course its going to be less significantly less.

I'm not complaining at all just relating what I'm getting. I still haven't figured out why it goes up over 70mph, must be coming up on a sweet spot on the cam.



Now if you really want to hear whining here goes;

I have a 625 horsepower at the crank high 10 second 3600# street car that gets 17 city and 25 hwy with an overdrive trans.

There are guys cruising the streets in 55-57 Chevy shoe boxes that weigh 2 tons have 650-700+ inch motors making 1600-1800 horsepower running high 6's at 200+mph getting 15 cty 25 hwy mpg towing a small trailer around to the events and tires a whole lot bigger than mine.

The technology is out there and I'm just getting started with it. I'll get my F250SD with a gas motor to make 400 crank horspower and 450 ft.lbs. of torque and still get 20+ mpg average. I will then tell you how to do it.

The technology has been out there for almost a decade and the car companies are still in bed with the petroleum companies screwing us.

25+ years ago Popular Science published Smokey Unich's report of taking a 2.2 liter Chrysler four cylinder and getting 345 reliable horsepower at 45 mpg on pump gas. He was just scratching the surface and Chrysler then proceeded to kill it. God only knows what could be done with a diesel.

Google alcohol fuel and read the reports coming out of the top engineering schools for the last decade. 30% better fuel mileage and 30% more power from alky on engines specifically designed to run alky with no power adders. Add superchaging/turbocharging and the sky's the limit These flex fuel engines are a joke. You can make 4-5 liters of alky in your garage for $1.25/gallon/day with an old 30 gallon hot water tank.

Again we're getting hosed!!!!!!!!!!!!!!!!!!!!!!!!!!
Okay I'll get off my soapbox now
Mikey

Here you go....you left this at home this morning:
http://members.tccoa.com/jlangton/tinfoilhat.jpg
JL

I needed a good midday laugh faster. Glad I checked this thread.

poor gas mileage
 

2004 F250 5.4 auto 9.2-9.3 mpg to work and back less than 10.8 interstate. Mileage was this poor then new, Service depart. says "it will get better after the motor breaks in "then after 30k they say "thats just the way it is".

Kengoff with that kind of gas mileage I'm suprised you don't see a trail of black smoke behind you on the highway.
My excursion at 80mph into a headwind gets 10! With moderate temps. I can get 16-17 at 67mph. 5.4 v8

Same boat Kengoff, 9 to 10. 4x4 for very long and it's down to 8. Half tank of gas for 110 mile highway run at 65mph. I swear all I have to do is look at it and the needle goes down.

in my 04 super duty xlt 5.4 im getting about 13mpg in town and around 14.5 - 15 highway. I grandpa the snot out of it though, rarely EVER allowing for more than 2k rpms.