2005 Mills raced in the AMA 125cc East Region Supercross series, earning top-six finishes at Daytona Beach and Orlando, Fla... Raced in the AMA 125cc Motocross Championship, earning a moto win and an overall podium finish at Buchanan, Mich... Raced with Red Bull KTM team.

2004 Raced in the AMA 125cc East Region Supercross series, best results were fifth-place finishes at Daytona Beach, Fla., and St. Louis... He entered the AMA 125cc Motocross Championship, earned his best result of fifth-place overall at Millville, Minn... Raced with Amsoil Honda team.

2003 Mills raced in the AMA 125cc East Region Supercross series, best result was sixthplace at Houston... He raced in the AMA 125cc U.S. Motocross Championship, best result was fifth-place overall at Southwick, Mass... Raced with Amsoil Honda team.