the motor runs good it only has 64000 on it but i dont want to hurt the motor right away since i still have a payment. your guess going from 10 ponuds on regular gas to 18 ponuds on premium how much more horsepower should i except to get and will running 18 pounds on 92 octane fuel kill my gas mileage cuz this is my daily driver

 

You need to put premium in it and flip the switch on the console to premium to see where you are at right now. Then turn up the boost from there. How much boost you run has absolutely nothing to do with mileage, it's how well you can restrain yourself from standing on it to feel the rush of boost that affects the mileage.