I have a gryphon custom tuned with 87, 91 & E85 performance tunes. I have run them all at one time or another and was pleased with the performance of each. My uncalibrated butt dyno places them in this order 91 best, E85 next and 87 heading up the rear. I did see a reduction in MPG with the E-85 of about 10-15% depending on the driving habits. MPG was about the same with the two regular gas tunes, some people see an increase useing the higher octane tunes but I didn't, sure is fun to drive though!
Jeff
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