Quote:
Originally Posted by strat61caster
Eh, until someone posts dyno sheets I doubt that you'd notice using your butt. My money is on < 5hp increase at most. I'd certainly buy it if it was available but I'd consider using 91 for daily driving.
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I'd be surprised if there were any difference at all, honestly, especially if you aren't at sea level. The only reason there would be a power difference would be if the lower octane caused detonation (and thus the ECU had to retard the timings a bit). 91 should be high enough to avoid that except in possibly extremely hot, sea-level conditions. As was mentioned by a prior poster, here in Colorado, 91 is as high as it gets (since the altitude reduces octane requirements).