At 250: Jimmie Johnson still ahead

FORT WORTH, Texas -- Jimmie Johnson continues to lead the pack. His car and pit crew have been nearly flawless through 250 laps. He has now led 102 laps.

Greg Biffle remains just behind Johnson, and continues to stay right on his tail.

Martin Truex, Jr. has moved back into fifth after leading for much of the early parts of the race.

Jeff Gordon remains in the pack at sixth, and continues to impress on his way up from the 34th starting position.

Tony Stewart has been the disappointment of the Samsung Mobile 500. He is 24th through 250 laps in his backup car.