Reigning champion Carmichael, riding only a partial 2007 season as he switches to four wheel racing, was completely dominant in his final AMA ride - sweeping both motos en route to the overall.
The Suzuki star, holder of a record 15 AMA titles, has thus won all six rounds he entered during his final motocross season, while his 150th win is head and shoulders above even the great Jeremy McGrath (89 victories).
"This is a sport that has made me and provided me a great life and lifestyle," said Carmichael, who will return to lead Team USA at the end of season Motocross of Nations. "I've surrounded myself with great sponsors and people that look out for me. It's funny to think that 1996 was my first national and it's weird to think that this ride is over. It's time to move on and I'm happy with every decision I've made."
With Carmichael's only real rival, James Stewart, missing the event through injury, Yamaha's Grant Langston finished second with a 2-2 moto finishes while KTM's Mike Alessi was third after 4-3 results.
With Carmichael out of the championship picture, the focus now turns fully to the points battle being waged between Honda's Andrew Short and Kawasaki's Timmy Ferry who exit Millville tied for the point's lead with 311 points apiece. Langston, who entered the race with a 27-point deficit, moved into the third position and now trails by 11 points. Short and Ferry finished fourth and sixth overall at Millville.
Stewart, the reigning AMA Supercross champion and obvious heir to Carmichael's outdoor crown, now sits sixth in the championship, 21 points from the top.
In the Motocross Lites class, reigning champion Ryan Villopoto picked up his third win of the season at Millville, but failed to gain ground on Kawasaki team-mate and title leader Ben Townley after each claimed a win and second place finish. Only two points separate the two riders with three races remaining on the season.
"I've got take my hat off to Ryan," admitted Townley. "He got out front and got going in the second moto. I tightened up in the middle and he got by me. I didn't have an answer for him. It's a still two dog fight for the championship race and it's great that we can still keep the racing really fair and clean."
Kawasaki's Brett Metcalfe was third overall with a 3-3 finishes.
The AMA Motocross Championship will break for one week before heading to Steel City on August 25-26.