[cool2miketlu]

Find Union76 website, there is a link to help you find a station that carries racefuel. Those are the stations that carry 100 Octane fuel, these racefuel has atleast double the hydrocarbon content than normal fuel so it burns better. If you are going to race at high speed, these are the fuel for ya

 

[cool2miketlu]

Lets assume you have 10 gallon tank you add 7 gallons of 91 to 3 gallons of 100 you would get 93.7 Octane. However you will be running better than a straight 93.7 octane straight from the pump (there is no such thing as 93.7 octane pump ofcourse) becuase that 100 Octane has soo much hydrocarbons it increase the quality of this 93.7 Octane

Most people fill up 3.5 gallon of 91 octane and 1.5 gallon of 100 octane to get 5 gallons total, afterall more fuel you carry more weight on your car