Fact is, to high of an octane will hamper performance on most normal engines. Burns slow and cold.

 

 

And remember, if you have ever bought a house and paid attention to interest rates. 1 point on interest in .1 not 1. So when you hear "will raise octane 1 point thats not 89 to 90 thats 89 to 89.1. So you do the math.
Don't waste your money

 

Just run 87 Pure and never worry.