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The octane boosters that do work are only effective for about 2 #s (i.e. 93 boosts to 95) when mixed at 1 oz per gallon. Most of the stuff on the parts shelves doesn't work well enough to bother with.

Stuff that's been tested independently for that 2-point improvement includes Amsoil's and the "race blend" NOS brand. There may be others that will get you 1-1.5 points, but I can't say which ones at the moment 'cuz all my research notes are on another 'puter. "
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This is incorrect. The points that they are claiming are percentage points. So 5 points on 93 octane gives you 93.5 octane. As said before, a large quantity is needed, If you have 5 gallons of 90 octane and 5 gallons of something that is 100 octane, you will have 95 octane. 5 gallons of pint size boost bottles is EXPENSIVE!