"The company’s ads claim the gasoline pills and powders they offer have a non-toxic “top secret gas pill” that can increase fuel efficiency by 30 percent or more and cut harmful emissions by up to 50 percent. In fact, the additive is basically the chemical equivalent of mothballs, which are toxic.
“BioPerformance claims its top-secret gas pills can save consumers big bucks at the gas pump,” said Attorney General Abbott. “These claims are bogus; the pill does absolutely nothing to improve gas mileage. The company is merely a smokescreen to trigger the recruitment of more and more paying members into what appears to be an illegal pyramid scheme.”
Scientists who tested the product at the University of Texas at Austin and at a Florida university concluded that the pills are mainly naphthalene, the chemical found in mothballs. The Attorney General’s laboratory expert actually concluded BioPerformance’s product could decrease engine performance."