^^well no ****.. haha but actually at my elevation I could run a lower octane and be just fine. Also our cars have a knock sensor so if you ran 85 you would be ok because the car will pull timing and not let the low octane fuel ruin the motor, it just wouldn't make a lot of power for that time.
If the mfg states that 91 is recommended than thats what I would run until other modifications requiring the race gas are made, but its your car, if you feel the race gas makes a difference that you like run it, just let me know how your engine is in two years
