Americans purchased 17.54 million cars and light trucks in 2016 -- more than ever before. While this has been a record year for a number of makes and models, not all vehicles are flying off dealership lots. Some models sit for months on end before finally being sold.

With data provided by vehicle research and valuation site Kelley Blue Book, 24/7 Wall St. reviewed the average number of days vehicles sat on U.S. dealership lots before selling in 2016. This measure, referred to as days to turn, is often used to estimate demand for certain models. It is not a perfect measure, though, as it also depends on supply. A model can have very high days to turn simply because manufacturers produced too many units. Generally, however, models with high days to turn have lower demand than models with low days to turn.

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While many in-demand vehicles sell in just a few weeks once they reach a dealer's lot, every model on this list typically remains unsold for at least four months. A few of these cars have an average days to turn of nearly half a year. Because large vehicles like SUVs, crossovers, and trucks have dominated U.S. auto sales recently, sedans, hatchbacks, and coupes make up the majority of vehicles Americans don’t want to buy.

15. Nissan JUKE
> Avg. days on lot: 127.4
> 2016 sales: 19,577
> 2015-2016 sales change: -27.8%
> Starting at: $20,250

14. Cadillac ATS
> Avg. days on lot: 129.1
> 2016 sales: 21,505
> 2015-2016 sales change: -20.0%
> Starting at: $34,595

13. Chrysler Town & Country
> Avg. days on lot: 130.3
> 2016 sales: 59,071
> 2015-2016 sales change: -39.4%
> Starting at: N/A

12. Mitsubishi Lancer
> Avg. days on lot: 131.1
> 2016 sales: 14,304
> 2015-2016 sales change: -19.1%
> Starting at: $17,795

11. Nissan Quest
> Avg. days on lot: 131.8
> 2016 sales: 11,115
> 2015-2016 sales change: +0.9%
> Starting at: N/A

10. Cadillac XTS
> Avg. days on lot: 131.8
> 2016 sales: 22,171
> 2015-2016 sales change: -4.1%
> Starting at: $45,595

9. Dodge Journey
> Avg. days on lot: 133.1
> 2016 sales: 106,759
> 2015-2016 sales change: -1.2%
> Starting at: $21,195

8. Kia Cadenza
> Avg. days on lot: 137.6
> 2016 sales: 4,738
> 2015-2016 sales change: -35.5%
> Starting at: $31,990

7. Fiat 500X
> Avg. days on lot: 146.0
> 2016 sales: 11,712
> 2015-2016 sales change: +3.1%
> Starting at: $19,995

6. Buick Verano
> Avg. days on lot: 150.3
> 2016 sales: 30,277
> 2015-2016 sales change: -5.0%
> Starting at: $21,065

5. Chrysler 200
> Avg. days on lot: 150.5
> 2016 sales: 57,294
> 2015-2016 sales change: -65.8%
> Starting at: $22,610