Hee hee, I just love this snake-oil stuff. Well, if the cheezy website, lack of solid data, and implausible claim of 35% fuel economy improvement isn't enough of a giveaway for you, how's this:
They mention the formula is patented. I read the patent (
http://patft.uspto.gov/netacgi/nph-...,266,082.WKU.&OS=PN/5,266,082&RS=PN/5,266,082)
Based on what I read there, this stuff is basically alcohol plus small amounts of naphthalene (i. e. , mothballs), iron oxide (i. e. , rust), zinc oxide (i. e. , sunscreen) and magnesium oxide. So, what they're selling you for about a dollar an ounce costs them maybe 3 cents per ounce to make. You might get a good (if expensive) buzz off it and maybe avoid a sunburn. The 'data' (and I use the term advisedly) presented in the patent is dreadful... for example, "Drivers involved in the test reported much improved engine performance and increased mileage using the additive" (uh, helloooo? some numbers here? maybe some statistics?????)
You know the drill: if it sounds to good to be true, it is. The way I figger it, my truck is already well-supplied with alcohol, sunscreen, and rust. As for the mothballs... well, I'm reminded of an old one-liner, but if I quoted it here Steve would undoubtedly feel the need to delete it!
Attention: TDR Forum Junkies 
