TROY, Mich.–(BUSINESS WIRE)–New-vehicle retail sales for the month of September 2021 are expected to decline when compared with September 2020 and September 2019, according to a joint forecast from J.D. Power and LMC Automotive. Retail sales of new vehicles this month are expected to reach 888,900 units, a 24.8% decrease compared with September 2020, and a 19.8% decrease compared with September 2019 when adjusted for selling days. September 2021 has the same number of selling days as Septembe