Cars and trucks get a "cost based adjustment": https://www.bls.gov/cpi/quality-adjustment/

According to this, hedonic adjustments and cost based adjustments are two ways that the US BLS performs quality adjustments for the CPI: [pdf] https://www.bls.gov/cpi/additional-resources/quality-adjustm...

For a higher level view of how these adjustments may have impacted the CPI, along with changes within individual categories, this article presents a fairly balanced view: https://www.lynalden.com/inflation/#cpi