race gas or pump non ethanol premium, which to use

It’s not every day you see someone post a picture of their project with Mr. Engine Masters tweaking on it…
Not my engine. It’s for another teams off road truck. I just got to be a small part of it. And any chance I get to sit in the dyno and listen to Brule talk I take. I learn so much from that guy. I go in to absorb mode. He’s forgotten more than most people will ever know.