what you really wanna try (if you're running sprints/quater mile without too much regulation
) is a mixture of 98RON & AvGas (aviation fuel!)
Mixed 1.00kg 98RON to 1.36kg AvGas (equates to something like 102RON) gave the best outcome on my race car....increase of 17bhp and a nice little blue flame when backing off throttle. Trouble is, the engine ran that much hotter internally, which resulted in a melted piston after 3hrs of racing
Useless info I know! (I'll go back to ordering my HiD lights then LOL!)