I believe Jim, especially since he did some actual testing. The gas they sell now is so full of crap that it has less energy than straight racing fuel, regardless of the octane. I had a source of 110 gas nearby but last time I went by the place was closed down. Darn! I just ordered some of the Maxlead 2000 stuff. Thanks for the link. I'll share my results. My 389 pings at WOT on 93 octane no matter how I mess with the timing. I need octane!