Changing to a Jaguar, Gregory won several races in America, including the Guardsmans Trophy in Golden Gate Park, San Francisco and a race at Offutt Air Force Base in Omaha, Nebraska.
Cambiando a Jaguar, Gregory gañou varias carreiras nos Estados Unidos, incluíndo o Trofeo Guardsmans en Golden Gate Park, San Francisco e unha carreira en Offutt Air Force Base en Omaha, Nebraska.