Jeff Burton speaks to the media before testing for the NASCAR Sprint Cup series auto race car at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Martin Truex Jr. pauses as he speaks to the media before testing for the NASCAR Sprint Cup series auto race car at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

David Regan stands by his car before testing for the NASCAR Sprint Cup series auto race car at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Greg Biffle pauses as he speaks to the media before testing for the NASCAR Sprint Cup series auto race car at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Crew members push driver Kevin Harvick's car through the garage area before testing for the NASCAR Sprint Cup series auto race car at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Greg Biffle sits in his car before testing for the NASCAR Sprint Cup series auto racing at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Matt Kenseth stands outside his garage area before testing for the NASCAR Sprint Cup series auto racing at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Brad Keselowski, right, talks with Joey Logano, left, before testing for the NASCAR Sprint Cup series auto racing at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Greg Biffle drives his car during testing for the NASCAR Sprint Cup series auto racing at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Carl Edwards drives his car during testing for the NASCAR Sprint Cup series auto racing at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)

Kevin Harvick drives his car during testing for the NASCAR Sprint Cup series auto racing at Charlotte Motor Speedway in Concord, N.C., Friday, Jan. 18, 2013. (AP Photo/Chuck Burton)