Roger Penske has warned his NASCAR team to stay out of any controversy regarding the possible manipulation of tires used during races. The team owner is aware of rampant industry speculation that some crews are drilling tiny holes in tires to allow air to escape during a race, a process known as ''bleeding tires.'' NASCAR has confiscated tires the last two weeks, including those of Team Penske driver Joey Logano following the race at Phoenix. Logano and Kevin Harvick's tires both cleared a second inspection. NASCAR took tires from four other drivers after last week's race at California, but results of an independent inspection haven't been released. More...