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Octane and performance
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Posted by Bob Davis (more from Bob Davis) on Wed, 18 Sep 2002 15:17:31 Share Post by Email
In Reply to: 89 octane gets better MPG that 93?!-->, roman, Wed, 18 Sep 2002 08:29:23
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Some years back CU did tests on some mundane cars, none turbocharged, to ascertain relative mileage and performance gains/losses from various qualities of gas. Their conclusion that there was little or no difference, but again they weren't testing Saab turbos.

OTOH, R&T magazine tested a C900T with APC in the early '80's, and it performed 0.7 seconds faster through the quarter-mile with 93-octane versus 87.

I would be very surprised if 89-octane performs noticeably better than 93, but if you are not detonating with the 89-octane it should not be worse, and will obviously be cheaper. If you notice your boost gauge popping back rapidly on full-throttle acceleration, indicating detonation, you might want to switch back to 93.


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