Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

Newbomb Turk said
91. Always use the highest grade they have.

Regardless of the octane rating the highest grade is the most regulated.

I’m currently at Walmart where they have 93 for $2.99 a gallon, how they get it that low is beyond me. Probably will start coming here from now on to full this thing up. The gas station I go to that has cheap 87 has 3.69/gal 93