Several threads similar to this. Last time I came across one I replied with some of the actual math that one should use to calculate effective octane rating based on adding things.
Math is fun kids, check it out
If you are using a bottle of snake oil, do the math at what it does per volume of fuel you are working with and make an informed decision.
Non-math example with real world economics:
If I use 15 gal of 87 octane, I save about $4.5 vs buying premium (30c per gallon, some spreads are lower so this is a high number). You are not going to raise your the effective octane 4 points on 15 gallons of fuel for < $4.50.
If you find such a product, let us all know. Just watch out for strangers hanging around your house...it may be Big Oil trying to silence you.
- b