Those things sound like a P.T. Barnum Special. I'd like to see a 3-month gas mileage record, instead of a couple of tankfuls. Over the past 50 years, I can't count the number of gimmick spark plugs that have come and gone. I guess there's enough suckers out there to keep them in business.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!