I am pleased to report that I recently downloaded the 9r08 rev. and my mileage is noticeably better with it than it was with the 9r04 Rev. I am going on a trip this weekend and will be on Interstate about 250 miles each way so will be interested to see what it gets on this kind of trip.

I had the same results concerning the mileage drop when I loaded the 87 tune (9r04 rev.) but when I downloaded the 9r08 rev. and installed it my mileage and performance increased over the stock tune. For my truck the 9r08 rev. was a noticeable improvement over the 9r04 rev. I noticed the same drop ...

Yes, it is stock on axle ratio and tire size. I went onto tirerack.com and found my tires because they actually have a column that shows revs per mile for the selected tire. When I went in to modify parameters I went to modify revs per mile and it appears to have only been able to modify stock tune ...

Do the factory mileage computers calculate only on tire/gear size, or combined with other factors like air fuel ratio?
blasater, try calculating fuel mileage the old fashion way.(odometer/gal.) I went on a 160 mile trip and pulled a small trailer this weekend and intended to calculate my mileage ...

I recently purchased the U7151 Predator(Rev. f150-9r04).

Vehicle is 2008 Ford F150 Lariat Supercrew 5.4L 3V.

I posted problem of losing considerable mileage after performance tune(see previous post copied to bottom). I decided to try to reload the Rev. f150-9r04 to see if that would help my ...

I recently purchased the U7151 Predator(Rev. f150-9r04).

Vehicle is 2008 Ford F150 Lariat Supercrew 5.4L 3V.

I loaded the 91 Octane performance tune and filled the tank with super unleaded(92 octane) and went on a trip and set the cruise to 65. After around 180 miles on US & Interstate highways my ...