AVONDALE, Ariz. -- You'd think Jimmie Johnson would walk into Phoenix International Raceway feeling bulletproof. The five-time NASCAR champion is coming off a Daytona 500 that ranks among the most significant race victories of his career, and into a 1-mile track where he's won four times. And yet, in preparation for this event his focus was not on triumphs -- but on shortcomings in the event here last fall.
