SM_Shadowman

Where did you hear that? Higher octane gas does not burn faster.

Octane is a measure of resistance to detonation. It's almost like the opposite -- lower octane fuels will burn faster. Oversimplification: Higher compression engines like the VQ are engineered for high octane fuel -- the high compression makes detonation more likely and burns fuel faster and the higher octane counters that.

cdso

I always thought it was the opposite. When you use lower octane gas and get knock...the ecu retards the timing, which makes it feel like you're towing an elephant...which makes you push the skinny pedal more to get the same performance...thus lower fuel economy.