08 F150 Lost MPG after Performance Tune

[blasater]

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 command center said I had averaged only 17.6 mpg. I reinstalled factory tune and on the return trip on the same roads with same gas still in the tank I got 21.4 mpg average on the readout. I then filled up with regular unleaded and drove another 60+ miles (still with factory tune) and got 21.4 mpg average again. Today I installed the 87 Tune and went on a 60+ mile trip and it dropped to 17.0 mpg average for that trip. My mileage drops noticeably when I use the performance tunes and with my driving style I really can't notice any performance difference.

I see on the bar code on the end of the box it says "Predator 04-08 F-150 4.6L 3 Valve Only". Could it be possible that it is loading a tune for a 4.6L engine. I thought that the f150-9ro4 revision was for 5.4L also.

Any suggestions as to what makes my mileage drop so?

Thanks

[sohfast94]

Waht you really need to do is manually calculate the mileage because the heads-up displays are known for being very innaccurate...

[blasater]

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.

[concoursd]

good to hear.

[mikel]

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.

awesome, thanks for the feedback!