Also if the octane booster says it will give you 3 points higher, its actually .3, so if you have 87 and throw a tanks worth of booster in there you are now a few dollars shorter and running a strong 87.3, not 91, so really its not worth it, unless for a winterization perspective which would make sense. Also if you have fuel injection it should have an O2 sensor which should (via the computer)alter the air/fuel mix to stop the detonation, my truck says use 87, but it has 140000 miles and when towing when its hot I put in 89 and it cures my knock issues, it has fuel injection but obviously can't compensate
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