Tavi
Vehicle enthusiasts
Octane is to rate the fuels ability to resist detonated. It has nothing to do with the energy in the fuel. Run the lowest octane your engine will run on. I know TBIs are fine with 85. I’d bet the vortec is too, but can’t say I know. But I’m sure someone here will confirm or deny.
Unless you have increased the compression or advanced timing running high octane will only waste money.
Unless you have increased the compression or advanced timing running high octane will only waste money.