Dbez1 I agree go 93 octane. Higher compression ratio require higher octane fuel or it will detonate. Detonation caused the timing to advance and the heat from that caused the hole in the piston. If the air/fuel ratio is correct the octane itself won't change the heat that much. Now theres several things that change detonation, Shape of combusion chamber, compression ratio, engine temp., cam profile, sharp edges inside of combusion chamber that may glow with heat and air/fuel ratio. So yes stick with 93 octane. .30 cents a gal. is cheep insurance.