We can’t have a conversation about greenhouse gas emissions and the environment without first addressing the Renewable Fuel Standard (RFS). Why? Because not only is the current generation of biofuels failing to deliver promised environmental benefits, it’s actually working against those goals.
Running E15 gasoline in a car that is not approved for it could cause engine problems. Ethanol is known to corrode rubber and some metals and can cause additional moisture in the fuel tank for cars that sit for a while.