DAYTONA BEACH, Fla. -- Jimmie Johnson ignores the phone call, but the look on his face suggests he shouldn't.
The expression is part confusion, part concern. In moments like this, when Johnson's mind begins to buffer toward the download of an answer he seeks, his face tends to stiffen to a distant blank stare, eyes narrowed and aimed toward the horizon, beyond the minutia directly before him.
He is driving a black Chevy Suburban on Florida Highway 836, westbound from South Beach toward Miami International Airport, where he'll hang a sweeping left and grab Highway 826 south to Homestead.