According to this Indianapolis Star article in the Des Moines Register, the Indy Racing League is getting better fuel mileage this year on ten percent ethanol. “Of course, the league’s cars aren’t known for their fuel efficiency; traditionally, they burn through a gallon in less than two miles.”
Next year, the league will fill its cars with 100 percent fuel-grade ethanol. The entire racing industry will study this move. If successful, it could spark a sweeping change in racing. The league’s engineers are confident it will proceed smoothly.