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post #3 of (permalink) Old 22nd November 2005
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I certainly noticed a difference a few years back when i had an bmw m3 3.2 evo.

these cars were meant to run on 98 octane, bute super unleaded was 97. when optimax came out with its octane 98 rating, i certainly noticed an increase in torque.

used the same fuel in my alfa 166 3.0 and noticed no difference.

it does seem to depend very much on the car.
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