A change in marketing focus led to only one race per year beginning in 1911. An estimated 80,000 spectators attended the first race on Memorial Day, May 30, 1911. Forty cars competed with Ray Harroun winning at an average speed of . While all the other drivers in the race had a riding mechanic in their car, Harroun decided to save weight and go faster by driving solo. So, to be able to see what was happening behind his No. 32 Marmon "Wasp", he installed a rear-view mirror. It was the first time such a device was used in an automobile.