The white Jaguar Mk 1 from 1957, 2438 cc, 112 HP, max. speed 203 km/h

The Jaguar Mark 1 is a British saloon car produced by Jaguar between 1955 and 1959. It was referred to in contemporary company documentation as the Jaguar 2.4 Litre and Jaguar 3.4 Litre. Its designation as Mark 1 was retroactive, following its October 1959 replacement by Jaguar’s 2.4-litre Mark 2.

The 2.4 Litre was the company’s first small saloon since the end of its 1½ and 2½ Litre cars in 1949, and was an immediate success, easily outselling the larger much more expensive Jaguar saloons.

The 2.4 Litre saloon was announced on 28 September 1955. The 3.4 Litre saloon announced 17 months later in the U.S. on 26 February 1957 was designed for the American market and was not at first freely available on the domestic market.

A 2.4 Litre saloon with overdrive was tested by the British magazine The Motor in 1956. It was found to have a top speed of 101.5 mph (163.3 km/h) and could accelerate from 0–60 mph (97 km/h) in 14.4 seconds. A fuel consumption of 18.25 miles per imperial gallon (15.48 L/100 km; 15.20 mpg‑US) was recorded. The test car cost £1532 including taxes.

They went on to test a 3.4 Litre automatic saloon in 1957. This car had a top speed of 119.8 mph (192.8 km/h), acceleration from 0-60 mph (97 km/h) in 11.2 seconds and a fuel consumption of 21.1 miles per imperial gallon (13.4 L/100 km; 17.6 mpg‑US) was recorded. The test car cost £1864 including taxes of £622.

A manual overdrive version of the 3.4 Litre was tested by The Autocar in June 1958. Its 0–60 mph (97 km/h) time was 9.1 seconds, and 0–100 mph (160 km/h) in 26 seconds, little more than a second behind the contemporary XK150 with the same engine.

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