A Sprite in your Spirit, a Bogle in your Benzine, a Fury in your Fuel, a Greyhound in your Gasoline. With acknowledgement to the oil company which, many years ago, urged us to “Put a Tiger in your Tank.”

“It is far too easy for promoters of such products to make extravagant claims, and very difficult, time consuming and expensive to challenge such claims … there needs to be a system whereby advertisers can be required to prove such fulsome claims, rather than requiring disbelievers to disprove such claims.”

Yet another moan about homeopathic medicines from the pages of Skeptical Inquirer? Wrong! The quotation above is from the New Zealand Automobile Association’s Directions (September 1992), and refers to “Petrol Pills,” claimed by the distributors to improve your car’s fuel consumption by up to 17%, increase power by 8-12%, and to reduce harmful emissions. In careful tests, the AA could not confirm any of these claims.

The “Petrol Pills” promotion was backed by the usual “unsolicited testimonials” and by vague test reports of doubtful provenance. The subject of this next note has an apparently more respectable origin. It was observed by a contributor to Skeptiker, our German counterpart, at a well-respected technical exhibition, “Ceramitec,” in Munich.

Among the many well-attested marvels of modern ceramic technology was the stand of a Japanese firm, introducing “Mixrax” pellets — a “philosopher’s stone,” according to our German colleagues. A few pellets in your petrol tank will alter the molecular structure of the fuel (!), so that the specific heat of combustion is raised. This is claimed to allow fuel savings of 10-20%, power increases of 10-20%, the reduction of CO2 and hydrocarbon emissions by 30-40%, and a general cleaning of motor and exhaust systems. This material of paranormal power is made by sintering together over twenty common ceramic materials. One of these contains uranium, and the “Mirax” pellets contain much more radioactivity than is usually considered safe. Apart from the safety aspect, automotive engineers can see no way in which these pellets could work as claimed.

Our final “pixies” do not actually go into the tank; they are magnets which are fastened round the fuel intake to the carburetor. They are claimed to “excite” the fuel as it passes to the engine, making it burn more efficiently and less pollutingly. New Scientist has reported on a number of these devices recently. The British Advertising Standards Authority has ruled against the claims made for several, on the ground that no evidence was provided to substantiate them. More colourfully, a university engineer says a dead chicken wrapped around the pipe would be just as effective. American authorities, both state and federal, have used the courts to stop the sale of these devices until the claims are proved.

A joke from my boyhood was about a man who installed so many petrol- saving devices in his car that his fuel savings exceeded 100%, and he had to stop occasionally to empty his overflowing tank. Apparently the old chestnut has not lost its point.

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