Image source: CarMax, Inc.It hasn't been a pleasant couple of quarters for those invested in some part of the automotive industry. Despite many companies posting strong profits, the U.S. new vehicle sales market plateauing has offered many investors too good a reason to avoid auto companies. Even CarMax, Inc. (NYSE: KMX), which generates a vast majority of its gross profits from used vehicles and wholesale vehicles rather than new vehicles, has slid from its all-time high in 2015.