![]() ![]() 29 were built in a performance-enhanced 379 kW (508 hp 515 PS) sports version which reached 339 km/h (211 mph) tested by Auto, Motor und Sport at Nardo in 1988. The 959 Deluxe version attained 317 km/h (197 mph), the Sport version 319 km/h (198 mph). Tested by Auto, Motor und Sport, about 20-30 built with Ruf VINĢ,849 cm 3 (173.9 cu in) twin-turbocharged flat-6 331 kW (450 PS 444 hp) A total of 412 Iso Grifos were built 1963–1974. Two-way average speed tested by Automobil Revue in 1958. The XK120 that achieved this speed was a tuned prototype, not a production car. ![]() Some publications cite the XK120's timed top speed as almost 214 km/h (133 mph) in 1949. For the McLaren F1 the estimation by Car and Driver about the speed at the rev-limiter is used. In instances where the top speed has been determined by removing the limiter, the test met these requirements, and the car is sold with the limiter on then the limited speed is accepted as meeting this requirement. The mean of the top speed for both runs is taken as the car's top speed. To establish the top speed for cars the requirement is, in addition to the above, an independent road test with a two-way run. ![]()
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