Performance nut
Well-Known Member
You forget that the GT can run on 87 octane as well but it doesn't make 460HP on 87 octane. Mach1 can run on 87 but doesn't make 480HP when you do. Folks who tune don't usually care about 87 octane, they just want a bump in power. So the tune is geared towards someone who is only going to run 91+. Same with other tuners. Mine is 91 octane or E85. Didn't bother with 87 octane.The Ford tune/throttle body/CAI requires 91 octane, the Mach 1 does not. I believe most of the 20HP comes from marketing.
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