race gas or pump non ethanol premium, which to use

From D. Vizard in his Holley book, p.121.

' There is no performance value in a high octane fuel unless the engine's CR & thermal operating conditions dictate its need to stave off detonation. An 8.5 CR engine will, as often as not, produce a better output on a quality 87 octane fuel than a costly 110 octane race fuel.'