[Christ]

ISO-Heet is a little different beast than what we're discussing here.

I-H is just methanol, basically (the yellow bottle). It's to help remove/emulsify water in your fuel... the water that's inherently there. It actually does help some peope's vehicles run better, especially in colder weather, but many people use it as a band-aid for another existing condition, such as leaky vent lines or return lines, which allow moisture into the tank when the vehicle sits for awhile.