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Originally Posted by pk2
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I noticed "toluene" on the list as an anti knock additive. Never had a knock but that's just because the timing will be automatically retarded, but that will effect performance. I use Toluene in a pinch to up the octane, It has debatable burn characteristics but it is cooler.
That's strange the higher oct. gives worse mileage. Here in CA we get to set the standards for some 12 other states(sorry) (instead of looser fed standards). I thought we oxygenated with alcohol everything, 87-91 oct. No escape. It use to be just a summertime thing but I think it's year around now.
Is performance wonder how much performance is effected with 91 oct.
Regards, PK
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For anyone unfamiliar, octane rating is a measurement of the energy it takes to start a gasoline to burn, the energy content is the amount of energy that will be released when it does burn. There's no direct correlation between the two.
Different refiners use different mixtures to increase a fuel's octane rating some of these additives have higher energy contents than others. But in general, the additives they use to increase the octane rating has a lower energy content than the gasoline itself. This is what typically leads to the lower fuel economy.
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