In Reply to: Octane and Gas Mileage posted by BobD on September 13, 1999 at 10:46:51:
You're wasting money using such a high octane gas. The recommended is 89, and until I chipped my 89 535, that's what I used in KY.Sometimes I'd put 90 in it, but nothing higher. Higher octane does not provide any advantage unless your engine needs that extra processing. There is not any more power in high octane, mainly just anti-knock additives and addtitional refinement.