i've just found out from a good friend that there's a new pyramid scheme afoot involving pills that you put in your gastank to improve mileage. Anybody know any details?

Sounds interesting! I was curious, so I googled with the words "pills gas mileage" and here's what I found:

[mlm.business-opportunities.biz]

[scamdex.com]

[abcnews.go.com]

[mlmblog.typepad.com]