Thornton led all but the first time around the track in a caution - free 30 - lapper contested by many of the best drivers from across the United States and Canada .
Thornton is the 2015 tour champion .
Thornton , the 2015 tour champion , led all but the first time around the track in a caution - free 30 - lapper contested by many of the best drivers from across the United States and Canada .