BIDEN IS INCREASING THE AMOUNT OF ETHANOL THAT CAN BE USED IN GASOLINE TO 15%. DUE TO ETHANOL'S LOWER ENERGY CONTENT, FLEX-FUEL VEHICLES OPERATING ON 15% ETHANOL GET ROUGHLY 15% TO 27% FEWER MILES PER GALLON THAN WHEN OPERATING ON REGULAR GASOLINE. REGULAR GASOLINE TYPICALLY CONTAINS ABOUT 10% ETHANOL.