[FastPlastic]

I might be crazy, but I run a bottle of Iso-Heet in every tank. Someone suggested it a while back because of some problems I was having over the winter. First tank I put it in I saw a 1-2mpg increase. I figured It was just my driving, so I didn't use it in the next tank, sure enough it dropped back down. I went back and forth 2-3times and finally decided to just keep using it. Don't know what it does for sure, maybe boost the octane rating, or counter-act the 10% ethanol, who knows. All I know is it seems to make a difference and it's only about $1.75 a bottle in the 4-packs. Also guarantees I won't ever have any problems with water buildup in my tank.