HEMI Joel used stuff from Klotz while we were on Drag Week in 2018. It was easier to carry 2 gallons of this, than multiple jugs of race gas for the drives. It seemed to work well. No real signs or detonation, but then again, he was easy on the throttle while driving down the road. It was just insurance, since the 392 has 13:1+ compression. The stuff was very toxic. You don't dare get it on your skin, and we had to use a metal mixing cup, after the first use, as the stuff melted the plastic cup we first had.