Auto research firm Cox Automotive - the owner of the closely followed Manheim price index - published new high-frequency data for the first 15 days of July that shows wholesale used-vehicle prices continue to slide. This data suggests a continued easing of inflation. Manheim's July preliminary used-car price index plunged to 213.1, down 11.1% from the full month of July 2022. The index is now at its lowest level since August 2021. All major market segments saw lower declines year over year in the first half of July. Compact…