GT Fuel

[Sawyerjames]

If the car is stock you can get away with 87 octane. Of course, there's 87 octane from a major brand/distributor and there's 87 octane from Bob's Quickee Mart and Bait Stop type stores. The quality of the fuel overall matters as much as it's octane rating. Many folks on this forum have modified Mustangs. Even something as simple as a Ford Performance Power Pack requires premium (91 octane minimum) fuel. Pretty much any tune, even a mild one, is going to require premium fuel. Just something to think about.

You have a good point. Especially once you boost these GEN3 Coyotes... I can run logs all day and my car will knock on certain 93 verses others. I have found QT, BP, and Shell to be the go to's, but I was shocked at how sensitive these high compression motors are with different 93 pump gas once boosted.

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[Monopoly]

I used 91 Octane bone stock. 94 Octane using PP2.

As you can see midrange has a noticable curve between 87 and 91 in Eng Explained video below. Fast forward to 10:15