can someone tell me what running 93 octane vs 87 in our 5.4L v8's does for performance? and can someone with a tuner tell me if it increases power in the lower rpm range or just simply change shift patterns..

 

You won't see any benefits from 93 unless you're running a tuner. Run the lowest octane fuel you can get away with.

 

thanks for the responce what im curious about is how i could increase my torque im wondering if a tuner/chip could do this. or if i need different headers exhuast/intake and such. thanks!

 

The dealer can flash for 91 octane

 

thats cool.. now can the valve's in this engine handle the extra heat? how much faster would this wear out my engine... and what kind of power increase would i see? and how much would my dealer cost me to refash?

thanks you guys rock