2002 Mustang v6 - 13 miles 2 the gallon! help

[crzydrumer14]

I have a 2002 v6 mustang and after installing the 93 octane tune i began getting about 13 miles to the gallon. After figuring this out i immediately switched it back to the stock tune. Unfortunately, after doing this i am still getting only about 14 to 15 mpg. opossed to the 20 to 21 i had before. CAN I PLEASE GET SOME HELP!!!!!

I posted a thread a couple weeks ago and i got no response just a question asking where my fuel trims were set. I checked and they are both almost in the middle of the 0 and lean. There is your answer now can i get mine?

Thanks

[mikel]

If you put it back to stock and you are getting less mileage than before, there may be an other issue somewhere...

Check your O2 sensors, and the MAF for proper operation.

There is nothing the tune could have done to change your mileage when you go back to stock.

[crzydrumer14]

ok i fixed that im getting about 20 again stock. But still why when i install the 93 octane im still getting thirten?

[mikel]

Have you modified the car at all?

[crzydrumer14]

the only thing i have done is installed a high flow filter. Other than that no.

[mikel]

Install the tune and see what the short term fuel trims are doing, or try to get it to a dyno to see if someone can see whats happening.

[crzydrumer14]

how do i access the short term fuel trims?