American drivers have logged another billion miles on E15 in just the past three months, according to Growth Energy, which says the total number of miles driven on E15 now sits at more than three billion. Growth Energy CEO Emily Skor says the growth comes from “forward-thinking retailers who have figured out that E15 is smart business,” and from consumers who rely on the “value proposition” of E15 fuels. Growth Energy, which works with the nonprofit Prime the Pump, helps build the needed infrastructure and distribution of biofuel blends, which they say give drivers more choice at the pump. E15 is approved for use in all vehicles 2001 and newer, as well as in all flex-fuel vehicles, which combined represent more than 87 percent of vehicles on the road.