Since I purchased mine, I have alternated between 93/87, doing so when the tank is half full, which in my case is the E line. Though it would make sense that the ECU would retard the timing if a lower octane were used, hence lowering your HP rating. HOWEVER, what I find most intriguing about the recent price INCREASES is this. While the base price has risen, the relative price for Super Unleaded has not. I still pay the same $.20 premium over Regular, when the price was $1.60/gallon instead of the current $2.99/gallon, this morning.

Hey, has anyone figured out why the price of oil and gas has gone up anyway? Don't we have the same amount of oil in the ground when the price was $40 a barrel? A hurricane or limitations on the ability pump the oil should have no bearing on the price per barrel since ability has nothing to do with what is actually left in the ground.