Maybe a dumb question but what the hell.

Would anything bad happen to my engine if I were to add 2 or 3 gallons of VP racing fuel mixed with 91 octane fuel? I have a big race coming so I was just wondering. Thanks

 

If your compresion ratio is stock, and you haven't advanced your timing to take advantage of higher octane then you'd be totally flushing money down the toilet running racing fuel.

 

Alright then thanks.

 

Running to high of octane will make your car slower. Remember, higher octane burns slower than lower grades.

 

Alright, yeah its my friend who wants to add racing fuel to his stock stang not me. Thanks man