1900 @ 70mph, 3.73's with 33" tires, get about 17 mpg at this speed.

 

is 1900 to 1950 RPM at 70 MPH.

Later Mark.

 

4.88 gears, 20t speedo gear, 35" tires.
2200. doing 65 instead of 70

 

a little over 1900 @ 70, I usually do 80 on the highway @ about 2100.. 4.6L, 3.55

 

2006 XLT with 3.55 gears & stock 265/60r18's.

Prior to my lift I was running about 1800/1900 rpm's at 70 mph. I could get up to about 73 mph before I hit 2000 rpm's and that was usually about right where I set my cruise.

 

I know I bought a truck to do truck things, and not for great gas mileage, but I get 11mpg at 70 mph (or 2000 rpm). I have the k & n fipk and exhaust (I don't know what brand) and it just seems like 17 mpg is more than I'll ever get.

 

im running 2500 Rpm at 70.

 

Actually my last tank of gas before my lift I got 17.1 mpg's. My last few tanks (after lift) have been horrible, latest was 10.8 mpg's. I knew going into the lift and bigger tires I would see a drop, but not quite this much. Of course my speedometer/odometer have not been recalibrated yet so I don't think my mpg's are 100% accurate yet. Can't wait for the Troyer tunes to come in so those things can be corrected.

 

Here's mine. Actually, I started a thread like this check this out https://www.f150online.com/forums/sh...d.php?t=255630

 

Stock 3.55L 5.4L with gps running 1600rpm@70mph with 35" tires, after superchip tire calibrations speedo 3 mph faster..the truck will move out.

 

Go to nationaldrivetrain.com (hit calculator button on top left of page.