On May 27, more than 30 650-horsepower racecars will zip around the Indiana speedway of the Indy 500 at more than 200 mph, fueled by domestically-grown corn. Equipped with Honda’s new 3.5-liter V8 power plants, all IndyCars in this year’s racing season will run on 100 percent fuel-grade ethanol, a first for a major-league motor-racing series. . .
