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Not sure if running 91 would be a good idea, cuz it may start pinging cuz of the low octane when blipping the throttle. Not sure tho. Tomorrow when I go out to play with it some more I will record a vid (too late, cops will probably get called if it does fire)Just a base line for compression as you don't know the ratio. I know I can run high test and not have an issue at 195psi. If its higher i normally jump up to race gas. The e85 should be fine for a bit more compression. Kinda hoping @lorraine or @Polar_Bus to jump in here with some ideas. Short vid possible ?