New vehicle sales in the US in the first half of 2017 are expected to be 8.4m, down nearly 2.3% compared to the first six months of 2016.  With growing economic headwinds, full year sales in 2017 are predicted to reach 17.1m, down 2.5% from the record 17.5m sold in 2016 and within the 16.8 to 17.3m range set by Kelley Blue Book analysts earlier this year.