I did a somewhat similar test...............but with different fuels and measured different parameters. I converted my 6 to E85(105 octane) and raced it at the track, then I drove the hell out of it all week and filled it up with 91pump gas and wend back to the track the following week. The temperatures(87*) were the same as were the 60' times(1.89-1.90) and I ran .3 seconds faster running E85.....................and I still haven't had the ECU tuned to take full advantage of the E85 yet.