1914: France takes its second consecutive 500 victory, this time with René Thomas, the first occasion for consecutive rookie winners. Also, in a technological breakthrough, inaugural race winner Ray Harroun, in charge of the United States Motor Company team, develops a fuel-sipping carburetor that runs on kerosene. Driver Willie Carlson's Maxwell chassis proceeds to run the race to an eventual ninth-place finish on a mere 30 gallons; with the price at $0.06 a gallon, Carlson's total $1.80 fuel bill stands as the most economical performance in motor racing history.