As Toyota and Chevrolet left the series after 2005, Honda became the only engine manufacturer of the series in 2006, a role which lasted through 2011. During the Indy 500s between 2006 and 2011, there were no engine related retirements for six years in a row, also the first six times in the history of the race that that had happened. In the six seasons as the only manufacturer, the engines completed 1,188,376 miles of practice, qualifying and racing, and had just six race-day engine failures and no such failures in the entire 2008, 2010 and 2011 seasons.