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high octane 120-130

uid 4846's pic
posted by  JohnMc on  Tue Aug 22 02:36 CST 2006
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last visit: Thu Oct 23 07:42 CST 2014
[RELATED]

It's a waste of money *IF* your car doesn't need it.

Pinging with normal timing is an indication your engine needs it. Using lower octane and retarded timing might result in worse MPG and offset any $ savings.

My old Jetta (VR6 motor, what a gem) had a knock sensor and could adjust the timing to compensate for varying fuel octane. In cooler weather it hardly made a difference. But in hot weather there was a very noticable drop in HP when running 87 octane as opposed to 91.
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I'm JohnMc, and I approved this message.






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