So to lighten the mood a bit if you're interested, have a look at how some motorcycle guys sort out *their* fuel additive issues:

http://www.gixxer.com/forums/showthread.php?t=226570
I'm sure some of you have seen this thread before, but if you haven't, stick with it for the first 8 or 9 pages of posts. Is it real or BS? You decide!

Tony.