The majority of the best drivers are in Chevys so when the majority of the top talent are in the same maufacture then one side will dominate. Compare the top drivers with thier manufactures..it's Chevy by a long shot.
Chevy Drivers:
Jeff Gordon
Tony Stewart
Dale Jr.
Kevin Harvick
Denny Hamlin
Clint Bowyer
Jeff Burton
Kyle Busch
Mark Martin
Ford:
Matt Kenseth
Greg Biffle
Carl Edwards
Dodge:
Ryan Newman
Kurt Busch
Juan Pablo Montoya
Bobby Labonte
Kasey Kahne
Ellioit Sadler
Reed Sorenson
Toyota:
Dale Jarrett
Brian Vickers