Fuel Additives: Empty Promises

Increase your gas mileage by forty percent. Save money every time you fill up at the pump. These advertisements are flooding spam in-boxes on a daily basis, hoping to take advantage of the high gas prices. We all know how much it costs to fill up at the pump these days, but these advertisements won't save you any money... In fact, the mechanics we spoke with say they're just empty promises.

Luis Gonzales makes trips to the gas station often... He drives back and forth to Tyson, everyday. "Ten miles there, ten miles back, so twenty miles total." And with prices so high, he's tempted to use a fuel additive, that promises gas mileage miracles. "I'll try it. If others tried it, i'll try it too."

But one mechanic we spoke with says buyer beware. "If it sounds too good to be true, it probably is," says Isaac Bernal, a mechanic at Brown-Pontiac GMC. Not only is it too good to be true, it could be nothing but bad news for your car.

Tracey Davis at Tracey's Auto says "I have seen some cars have their injectors deteriorates. It's because you never know what chemicals are in there." And sometimes you could be paying for nothing at all" Davis says "I've dumped some out and they're completely water and you just never know what else you're putting in your car."

Richard Detterman learned that lesson the hard way. "It didn't work. It actually made my engine slower and decreased my mileage by 2 to 3 miles. Over my life, I'd say, and I'm 69 years old. I've tried it all and nothing works like they say it will."