As this article indicates in the Delaware County Daily Times that is from the American Institute of Chemical Chemical Engineers Brief, regulations do impact on the production economics for the United States. We are mandated to add at least up to 10% of ethanol from corn to our gasoline. As the United States supports this effort through subsidies to the corn growers and also a $0.45 per gallon subsidy to the suppliers of the gasoline, this means that running a refinery in the United States is just not economical. This of course means a loss of jobs not to mention this addition of alcohol reduces the mileage you get.
Even the Unions agree on this!