Check out this Jay Leno's Garage video and see what you think. I am especially impressed by the fuel "stabilizer" product which is mentioned towards the end of the video.
[video=youtube;h3ir3bg0ESU]http://www.youtube.com/watch?v=h3ir3bg0ESU#t=415[/video]
[video=youtube;h3ir3bg0ESU]http://www.youtube.com/watch?v=h3ir3bg0ESU#t=415[/video]