Mars and its M&M sponsorship has been a part of Joe Gibbs Racing since 2008. The brand has been a prominent sponsor of NASCAR teams since the 1990s, making its departure especially noteworthy. Busch and M&Ms have been one of the most successful driver/sponsor partnerships in NASCAR, winning two Cup titles together in 2015 and 2019. “One of the great things I love about NASCAR is the opportunity to build meaningful relationships,” JGR team owner Joe Gibbs said in a statement. “Mars has been a tremendous example of that. We have experienced so much together over the past 15 years, including two Cup Series ch …