The DeSoto Fireflite was introduced in 1955 as De Soto’s flagship model. The car was wider and longer than previous DeSoto models and it came equipped with a V8 engine producing 255 hp (190 kW) and PowerFlite automatic transmission. The transmission was operated by a Flite-Control lever located on the dashboard. The car weighed 4,070 lb (1850 kg) and cost US$3,544.
The car was best known for its long, tapering tail fins, often accentuated by a two-tone exterior finish. The interior offered bench seating that could accommodate six passengers. The Fireflite had a 0 to 60 mph (100 km/h) acceleration time of 11 seconds and a top speed of 110 mph (175 km/h).
The Fireflite’s bold design increased sales for DeSoto. In 1955, DeSotos sold well with over 114,765 examples produced, making 1955 the best year for the company since 1946. By 1956, DeSoto placed eleventh in U.S. production with an annual production of 110,418 cars. The success was short-lived, however, and De Soto went out of business in November 1960.
The Fireflite’s appearance for 1957 was modified with the help of Chrysler Corporation's head stylist, Virgil Exner. The design was bold and radical with large tail fins, dual oval exhaust and triple-lens taillights. The tail fins were not only aesthetic, but helped to stabilize the car at high speeds.
In 1957 the Fireflite was superseded by the DeSoto Adventurer as the premium DeSoto model. Nevertheless, Fireflites continued to offer high-grade appointments in a full line of body styles. Also in 1957, a station wagon was added to the Fireflite's lineup.