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Ravirn · 02-13-2010, 03:13 PM

Depends on where you live. The higher in altitude you go, the less compression your engine has. The need for "really high" octane goes down the higher up you go.
Once you cross over the 3000' mark or so, 91 octane is AOK. No knocking or pinging whatsoever. Try using OVER 93 octane where I live and good luck starting your car in the morning.

02-13-2010, 03:13 PM	#28
Ravirn Account Unaccounted for Drives: Black SS Join Date: Dec 2009 Location: Alberta, Canada Posts: 1,703	Depends on where you live. The higher in altitude you go, the less compression your engine has. The need for "really high" octane goes down the higher up you go. Once you cross over the 3000' mark or so, 91 octane is AOK. No knocking or pinging whatsoever. Try using OVER 93 octane where I live and good luck starting your car in the morning. __________________ WARLOCK (Black 2SSRS LS3) - A work in progress.