High octane doesn't add power... in fact higher octane gas is harder to burn, and burns cooler, which is why the car can advance the timing and make more power w/o detonating. High altitude has the same effect as octane boost... up here 91 is more like 93. Chances are your car will advance its timing as much as possible w/o pinging on 91, so octane booster is a waste of money, unless you get the ecu retuned for it.
__________________
Is you is, or is you ain't, my con-stit-u-ints?
|