RICHMOND, Va., 2017-Nov-29 — /EPR Retail News/ — CarMax, Inc. (NYSE: KMX), the nation's largest retailer of used cars, today (November 28, 2017) announced it is expanding its commercial relationship with RepairPal, a leading provider of auto service and repair via a network of RepairPal Certified shops. Additionally, CarMax has made a minority investment of $5 million as the lead in…