Despite December Drop, Manheim Used Vehicle Value Index Ends 2020 Near Record High - Index drops to 161.1 in December, remains up 14.2% from year-ago levels. - Wholesale prices for luxury cars and pickup trucks outperformed the overall market in December. - Used-vehicle sales volume was estimated down 5% year over year in December, with 2020 ending at 36.7 million, down from 40.0 million in 2019. News provided by Share this article Share this article ATLANTA, Jan. 8, 2021 /PRNewswire/ -- Wholesale used-vehicle prices (on a mix-, mileage-, and seasonally adjusted basis) decreased 0.59% month over month in December, putting the Manheim Used Vehicle Value Index to 161.1, a 14.2% gain from a year ago.