FoT I'm just looking for some input on race fuel. My compression ratio is 12.5:1 and I live at 5200' ( Denver ). I generally run 108 octane at about 75% race gas to 25% pump gas. Sometimes straight 108. Now I'm wondering if even 108 isB enough octaneB for 12.5:1 Just wondering what everybody else is doing. Thanks as always, Jim Gray