Jimmie Johnson looked as if he already had finished the hardest work. After starting at the back of the pack, he had moved up quickly, and when he passed Brad Keselowski for the lead on Lap 191 of 200, his No. 48 Chevrolet seemed to be the superior car. Then Johnson's engine faltered with only six laps remaining. He lost the race -- and the NASCAR Sprint Cup points lead -- to Greg Biffle on Sunday.
