To insulate domestic ethanol producers from competitors in Colombia and Brazil, the government imposes a 54-cent-per-gallon tariff and a 2.5 percent ad valorem tax on ethanol imports.

FORBES: Senators Back Legislation to End Ethanol Subsidy

Then there's a 54-cent tariff (not including a 2.5% ad valorem levy) to keep cheaper Brazilian ethanol out of the country.

FORBES: Field of Dreamers