If you're looking to remove outliers, Kelley Blue Book also tracks the average (likely mean) of new non-luxury vehicle sales, which was $44,626 in September. Non-luxury is about 80% of sales.

Also, concerning the lower end of sales:

"But the news isn’t all good. Only one car sold for an average price under $20,000 last month. The Mitsubishi Mirage’s average transaction price in July was $19,205.

Every other car with a list price under $20,000 sold for over $20,000 on average. It’s not a large group. Automakers increasingly focus on building more expensive cars, trimming affordable models from their lineups. In December 2017, automakers produced 36 models priced at $25,000 or less. Five years later, they built just 10." [1]

[1] https://www.kbb.com/car-news/average-new-car-price-sees-smal...