Quote:
Originally Posted by ChrisSlicks
 It's not the octane, it's the oxygen content. If you tried the same experiment with high-octane non-oxygenated fuel you would not gain any power, you might actually lose power. |
It's amazing how much octane is thrown around as a way to increase HP.
The car is designed to run on 91. Running less than that trips the knock sensors to retard timing. It won't advance timing due to higher octane - in fact, the car won't even "know" that it's running on higher octane, it simply knows that the knock sensors aren't tripping.