Around 10 Gran Torinos Were Used
As with all TV show productions involving cars, a single car is not enough. First, because of the type of shooting, which required one vehicle for close shots and publicity shots and one for action and stunt scenes. In every episode of “Starsky and Hutch”, a red Gran Torino was involved in a high-speed pursuit, a jump scene, or something equally as dangerous (via GQ Magazine).
So several stunt cars got damaged, which means more than one car was used. The exact number is believed to be around 10 vehicles. All were 1974-76 Ford Gran Torinos with identical paint jobs. However, they had slight differences in the shape of their white stripes.