Put a bed cover on my '03. Seemed to help highway mileage almost 10%. No improvement in town. Will keep checking to verify.

 

This blows my mind. I have never seen 11mpg on any stock truck in my life.
I can get 10 pulling a 16' trailer.

 

this is true... get 8... all the time:P haha my brother gets better gas millage than i do, and he was a 99 f350 V10! he gets 10!

 

I guess I 'm not doing to bad. W/winter fuel I'm getting real close to 13 mpg. I don't usually bother checking, but did a few months ago.

Back in O8, I updated everything I could think of to get it running like new again when she was @ 185,000 miles . I totally went thru engine, sensors, all O2's, New Coils, plugs (denso fine wires). NEW injectors, changed all drive-train fluids, ported and polished the intake and revamped the brake system. Added Long tube headers, high flow cats. Pretty much did everything at the same time

The truck in the summer was averaging 14 mpg before hand and after all that I did get 16 mpg...Honest! It didn't matter, city or highway, no better than 16 mpg. I cruised @ 70 mph on the e-way. But I was trying to see what it could get if driven civilized every where I could. I was going for mpgs, as ridicules as that may sound lol. I could of slowed down my highway speed, but just kept her at 70.

No tune, -that's with the factory tune too. I wonder if it will still do it this summer. If I'm still driven her, I'll see!

 

My brother has a lifted 04 with all sorts of **** and he gets the same if not better than me. My truck rarely goes over 2 RPM. I do live up North so I do get the winter blend. I'm hoping it should increase in the summer after I do some maintenance.

 

Believe it. I'm not the type to lie about these things.

Come and I will drive you around for a full tank of gas, I'll pay. I will show you a stock truck that gets less than 11 mpg with easy driving. LOL.

 

Oh i totally believe you man. I have been on here awhile and you are one of the level headed ones. And I know you keep up on maintenance ahead of schedule. I just can't understand why they vary so drastically.

 

I quit calculating my milage a few weeks ago, seemed like a loosing battle. I also quit paying attention to fuel prices years ago, because it doesn't matter what it costs, your going to need to buy it,

 

I believe it. I purchased a real clean 98 single cab short box , 2WD w/4.2L for my daughter about 8 years back and it couldn't even do 12 mpg. It was in the 11's. The 4WD with the 5four had better mileage lol.

I never totally went thru the 4.2, but we tuned it up. It was a good little truck, - just liked the fuel for some reason.

 

What engine and drivetrain do you have? Diff ratio?

I got an honest-to-goodness 22 mpg calculated on a recent 375-mile trip. Topped off the tank, reset the odo, and checked the elapsed mileage against the gas I put in the next time I refueled.

I have a 2WD extended cab 4.6 with a bed cover, 265/75s and a 3.08 rear, and it's in a good state of tune. The mileage setup, in other words.