MINNEAPOLIS, 2015-9-21 — /EPR Retail News/ — CarMax, Inc. (NYSE: KMX), the nation’s largest retailer of used cars, today announced a new partnership with the Minnesota Golden Gophers. As part of the multi-year sponsorship agreement throughLearfield Sports' Gopher Sports Properties, CarMax is now the official used car retailer of the team. CarMax will receive extensive branding within…