EPA runs the ethanol clock
Fifty-five ethanol manufacturers petitioned the EPA last March to allow petrol to contain up to 15% ethanol by volume, known as E15.
US petrol is now approved to contain up to 10% of ethanol, mostly derived from corn.
The head of the EPA admits the agency may have to work past the 1 December deadline because it is still reviewing test results on how the higher blend rate would affect engines across the board, including cars, trucks, snow mobiles, motor boats and lawnmowers.