By Yael T. Abouhalkah, Kansas City Star Editorial Board

This nation's massive and inefficient investment in ethanol has pleased Midwestern corn growers -- and fleeced U.S. taxpayers. It's time for Congress to end this madness.

Now, some members of Congress -- which ignorantly passed a pro-ethanol bill last year -- are rethinking their vote.

Good. Ethanol doesn't deserve its lavish taxpayer subsidies or mandated use by motorists.

Ethanol's problems are becoming better known.

The biggest is that gasoline blended with 10 percent ethanol -- the kind required in Missouri -- produces about 3 percent less energy than gasoline.

Also, corn prices have soared as more corn has been diverted to producing ethanol.

Congress caused a large part of this problem, passing a bill to require motorists to boost their use of ethanol in coming years.

Here's what Joe Lieberman, Connecticut Democrat, said of the situation: "It may be that we've met the problem, and we caused it."

Good analysis, senator.

Now it's time for Congress to undo the problem.

It's relatively simple: Rescind the 2007 law that mandated a five-fold increase in the use of ethanol and other biofuels in the coming years.

The corn growers will protest. So will the pro-ethanol lobby. But motorists and taxpayers will benefit, which matters the most.