GM and Stellantis reported slower US sales growth in Q4 2023 compared to earlier in the year, impacted by UAW strikes at some GM plants. Pent-up demand is being satiated while high prices and interest rates are causing some buyers to pull back from the market. Toyota's sales rose over 15% in the fourth quarter, aided by new hybrid models, while Hyundai also saw a 5% gain and a record sales year.