Top 10 New Vehicles that Languish on Dealer Lots, Fall 2017 Published on September 28, 2017 in Top 10 by Michel Deslauriers Photo: Fiat Chrysler Automobiles 4- Fiat 500LThe coach potato champ of January 2017 has improved its situation—a little. Its number of inventory days dropped from 225 to 201, which is still a lot.