87 octane vs. 91 octane
I have 3 tunes, 87 performance, 87 tow and 91 performance. I know that running the 91 tune with 87 octane is not a good thing but what about the other way. Specifically, any harm done running the 87 tow tune with 91 octane while towing or carrying heavy load in bed?
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'05 F150 FX4 SCAB
K&N FIPK
Magellan Navigation System
Full Boar Performance SIDO exhaust
Gryphon PHP Programmer w/ custom tunes
4UCam wireless backup cam
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