The 1973 Ford Mustang Mach 1 marked the end of an era in two important ways. It was the last year of the muscle-car Mustang design, as well as the last year of the Mustang convertible. Due to the pending gas crisis, buyers were shying away from gas-guzzling performance cars and opting for more economical vehicles. In response, a 250-cid six-cylinder engine was offered in the Mach 1 for 1973. Also, due to new government regulations, it was the last year that Ford would produce a Mustang convertible until 1983. Also gone were the monster engines of past years, although a 351 V8 making a weak 156 horsepower was still available.
