Carr became the seventh different winner in the seven-race series, the Pennsylvania resident getting the holeshot and never looking back as he led all 25 laps for his 75th Grand National victory.
Behind him, Johnson had everyone’s attention as he crashed but managed to get up and still finish ninth – a spot that earned him the title first-ever AMA Grand National Singles Champion.
Johnson came into the night with an 11-point lead over Joe Kopp with Henry Wiles, Johnny Murphree and JR Schnabel all having mathematical chances of earning the title. Kopp, Murphree and Schnabel, however, all failed to make the main event, giving Johnson the breathing room he needed.
Kenny Coobeth finished second in the National with Henry Wiles ending up third.
Johnson ended the night with a 13-point cushion over Wiles. Kopp ended the series in third, just one point ahead of Carr.