When i was on pump 93 with 11.25:1 i could only run 1/8 mile wot runs on the back roads, so short passes and no sign of detonation on plugs. Now at 12.5:1 and 100 octane, no sign of detonation of plugs yet. This Dragon fuel(Terragon 110) is really 113. Don't understand their rating. I don't hear and or see it on plugs.