Date: Fri, 16 Apr 1999 16:29:01 +0200
From: Andreas van der Wal <>
Subject: Higher octane improving performance?

Hi, I have wondered in what way the octane corresponds to the performance of the engine. I know that higher octane prevents knocking and therefore can tolerate higher combustion which could lead to more hp. The question is rather if I one time fill up my car with 95 octane fuel (european values) and the next time with 98 octane fuel, how would that influence the run of the engine. Suppose that higher octane gives me more hp, will that mean that I can lower my fuel consumtion? Will it change the rpm where I get most hp? Will it only be effective when really giving full gas or also when I drive like an "old lady"? If someone knows, I would really be interested. / Andreas

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