SANTA MONICA, Calif.--(BUSINESS WIRE)--As new 2016 model year cars and trucks arrive on dealer lots this month, substantial savings abound on outgoing 2015 models, according TrueCar, Inc. (NASDAQ: TRUE), the negotiation-free car buying and selling mobile marketplace. September ranks as the year’s second-best month for consumers in the market for a new vehicle. A review of 2014 new vehicle transactional data by TrueCar indicates September generated average savings of 7.6 percent off the Manufact