American drivers are hitting the road on more 15% ethanol than ever before.

According to Growth Energy, American drivers have surpassed another billion miles on E15 in just five months this year, bringing the total miles driven across the U.S. to 2 billion. This comes on the heels of Growth Energy’s recent announcement that more than 1,000 stations across the country are currently offering E15 to consumers.

“This latest milestone cements the fact that drivers have embraced the tremendous benefits E15 offers and highlights just how rapidly consumer demand is growing,” said Growth Energy CEO Emily Skor. “E15 is experiencing incredible growth both in terms of retailers offering it at their convenience stores and consumers reaching for it at the pump. This momentum is another clear reminder for lawmakers that we must make this choice available year-round.”

E15 is approved for use in all vehicles 2001 and newer, as well as, all flex fuel vehicles, which combined represent more than 87 percent of the vehicles on the road.