I have three 11.1:1 cars and have always blended 110 leaded race fuel with pump gas,about 60/40 (race/pump) or 50/50.
Have never had a problem with detonation but I don't drive these cars a whole bunch either...
Having a true 11.1:1 forged steel 550hp/383 stroker built right now for the X-77,it will be a monster by the time I'm done.
