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#6
01-20-2011, 06:41 AM
Hummer Veteran
Join Date: Dec 2010
Location: Columbus, OHIO
Posts: 134
Re: 87 or 93 octane?
Quote:
Originally Posted by HUMTECH
If you are gonna run a 93 octane tune it will advance your spark timing. It calls for higher octane fuel due to its resistance to burn. If you advance the spark timing you want to slow the burn, thats what higher octane will do. You can run 87 but if you hear "ping" or detonation you should bump up to a higher octane reading
Beat me to it. 
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