Okay, so i am going to be taking in my suburban for the final stages of my E-test, and I want fresh fuel in there. The truck has like a quarter tank in it, and I bought a bottle of Octane booster, but will that even revive it?? Or should I drain it, and put new fuel in it?? Also, would dumping the octane booster in a fresh tank of gas be a bad idea?? I've buying high octane fuel is bad for engines that do not need it?? And will a higher octane reated fuel help the truck to test better, or will the TBI compensate for the higher octane level, and it will do poop for me. I already bought the bottle, so i don't want to waste it.