Most of the gasoline sold in this country contains 10% ethanol, a high-octane fuel derived from corn.&nbsp; Now the government wants to increase that percentage to 15%, a level many auto manufacturers claim will damage vehicle engines.&nbsp; Whose opinion do you trust?&nbsp; Read more:&nbsp; <a href="http://www.foxnews.com/politics/2013/05/07/auto-makers-warn-new-ethanol-mandate-could-damage-cars/">www.foxnews.com/politics/2013/05/07/auto-makers-warn-new-ethanol-mandate-could-damage-cars/</a><br />