This past Sunday’s Xfinity 500 at Martinsville Speedway drew 2.5 million viewers on NBC, the network announced Wednesday. That represents a 14% jump in viewership from last year’s Round of 8 finale at Martinsville. The Xfinity 500 was the fifth consecutive and seventh of the last eight races to see an increase in viewership from 2023. NASCAR Cup Series playoff viewership is up 6% in 2024. CLICK HERE to go to PrizePicks and use code ON3 to receive a guaranteed $50 once you play $5 in lineups! Fans who tuned in were treated to a race featuring six of NASCAR’s best drivers looking to join Joey Lo…