[beef_bourito]

i wouldn't use it that often though, once or twice and you should be good for a long time. as for the octane booster it really depends if you need it, run on supreme with a spare can of boster, if it doesn't knock, run lower octane, do that untill you're at the lowest octane you can get from the pump. if your engine knocks, pull over, turn off the engine, add the booster, and run on whatever the next octane rating is.