Report: Tony Stewart plans to retire after 2016 seasonThree-time NASCAR champion Tony Stewart plans to retire at the end of the 2016 season.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceThree-time NASCAR champion Tony Stewart plans to retire at the end of the 2016 season. Loading recommendations... Please wait while we load personalized content recommendationsPublished Sep 28, 2015 | Modified Sep 28, 2015SI STAFFShare on FacebookShare on XHome/Racing