Well, the mustang is a built motor single turbo 4.6, 17-18lbs of boost so very applicable. I do have much lower charge temps than most ecoboost combos but I don't have the benefit of direct injection with the mustang so it is a wash.
I compare notes with a few of the local tuners and the only oddity that has been discovered is that the shell 91 resists knock better than chevron's 94. No one's power adder car is making 700+ on 87 octane fuel around here, unless they are getting most of their fueling from their meth kit.
I compare notes with a few of the local tuners and the only oddity that has been discovered is that the shell 91 resists knock better than chevron's 94. No one's power adder car is making 700+ on 87 octane fuel around here, unless they are getting most of their fueling from their meth kit.
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before I do the tune. I’ve used nothing but 93 since I got the ST. 
