mike i just order mircotuner. Question can i just set my shift point and adjust my speedo. and leave everything else stock so i can run 87 octane fuel ?. Then if i decide to run more performance set up to run 92 octane ?. P.S i hope i get it before jan 8, that when it going in the shop for the gears swap.

 

To the best of my knowledge, once you install the M-T program, it's premium all the way...no option for regular.

 

Nope - asked this question yesterday - see Mike's response:

https://www.f150online.com/forums/sh...hreadid=100905

 

Hi hmiz,

Sorry, no can do.

As you'll see in the link that LightningCrew so kindly provided, you have to accept the engine tuning or you get nothing. You cannot *ever* use the Micro Tuner on anything less than good quality premium gasoline, and in California, the best pump premium you can generally get is Chevron's 91 octane.

Good luck on the gear swap!