I use SeaFoam in everything that I feed with ethanol added gasoline. Couple times a year in the cars/trucks that get almost daily use and every few fillups in smaller engines or those that sit for longer periods of time. Basically, if a load of ethanol fuel is going to be in the tank for more than a couple of weeks, it has SeaFoam it in. If I have a tank of ethanol free gas, I don't bother. I wish SeaFoam was less expensive.
Chevron Techron is my #2 choice. When I find it by the case at Sams, BJ's or Costco for a good price, it moves up to #1.
