NateHale: Context is always good!
EG: my
mom was managing just ~15 mpg from a 4-cylinder Camry in winter conditions driving short trips in the city. And yes, she drives like a little old lady. Makes 17.5 mpg from a V6 Lumina in stop & go conditions look a bit more interesting, doesn't it?
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I don't think you'll find anyone who's done any controlled testing on that additive. If the product genuinely saved fuel on an otherwise properly working engine, they would have run it through the EPA's approved lab test procedure for aftermarket products and would be selling with that gold seal of approval. (EG: see
http://ecomodder.com/forum/showthrea...ery-11445.html ) They're not, and that should tell you all you need to know.