My buddy and I did a JDM motor swap in my '07 Corolla S. I know that the motors run on a higher octane in Japan. I've recently gone to using a concentrated racing fuel, and the car runs alot smoother and the gas mileage is a lot better as well (imagine that). So...my question is: Does anyone have any ideas on something that is cheaper than this stuff, or something I can do to get the same result?