The fight between federal regulators and auto lenders over alleged discrimination in auto loans officially got a lot broader this month, as the Consumer Financial Protection Bureau asserted its authority over so-called “captive” finance companies that belong to the auto companies...CFPB has zeroed in on the fact that lenders typically allow dealerships to set their own “dealer markup” on loans...to compensate the dealership for helping generate loans...According to the CFPB, the problem is that dealerships sometimes use that discretion to charge more, for protected classes of borrowers.  The auto finance industry strongly denies that it tolerates discrimination.