Recommended Fuel Question....

I don't know if it's true, but the consequence of running regular fuel in a high compression engine, is that you would get knock, which is harmful to the engine. My Lexus requires 91 octane, but I can get away with running 89 in it w/o knocking if I don't run it hard, but I don't like to do it often because you never know when you'll need to hit the gas, and I don't wanna blow the engine over that. If the engine is never, it should have a knock sensor that will retard the timing if you use a lower grade gas, it will keep the engine safe, but will sacrifice performance.