Octane boosters do exactly what cop said, they add usually a tenth.
So, your 87 goes to 87.2, or maybe even 87.5 if its strong stuff.
If you aren't filling it with 91+ everytime at the pump then I feel sorry for that car. Boosted cars NEED premium fuel...always. Now if you are using 91 and add the octane booster I'm sure that'll help it a little, or adding it to some pump 92 or even 93. I always ran 93, hell I even run 91 in the N/A silver car I have. Why? Because these cars knock from the factory. Knock destroys these things. Look at it this way...
$3~ per fill up, or $500+ for a new bottom end.
Thoughts?
