Claim: "Without ethanol, gas prices would be at least 15% higher. With gas at four bucks, that means you're saving 12 bucks on a 20 gallon fill up."
Fact-check: Wisconsin Corn Growers Association says that without ethanol, gas would cost 15 percent more 
Verdict: half-true
Organisation: PolitiFact
Author: James B. Nelson
Date published: 2011-05-29T00:00:00