NAPA Auto Parts said Thursday it will end its multimillion-dollar sponsorship of Michael Waltrip Racing at the end of the year, the latest fallout from the team's attempt to manipulate a race to get Martin Truex Jr. into NASCAR's version of the playoffs. Napa is Truex's primary sponsor and in the first year of a three-year extension announced last August. The deal ran through the 2015 season and is believed to be worth at least $15 million a year. "NAPA believes in fair play and does not condone actions such as those that led to the penalties assessed by NASCAR,"...