The Environmental Protection Agency just approved the year-round sale of E15, a gasoline blend comprised of 15 percent ethanol. Until now, the agency had banned the mixture during summer months, since high-ethanol blends react with hot air to form smog.

Most cars can't handle this high-ethanol gasoline. So, by pushing more E15 into the fuel supply, the EPA could wreck vehicle engines and put drivers on the hook for costly repairs. Let's hope officials reverse their decision before it's too late.

The average vehicle is more than a decade old. High-ethanol fuels can damage these older-model c...