In March 1950, car manufacturers Rover, unveiled the first car powered with a gas turbine engine. JET1, a two-seater model powered by the same kind of engine used in a jet, had its first public test drive at the Silverstone racing circuit in Northamptonshire. JET1 was built with the engine positioned behind the seats, air intake grilles on either side of the car and exhaust outlets on the top of the tail. During tests, the car has reached top speeds of 90 miles an hour, with the engine running at 50,000 revs per minute. The car ran on petrol, paraffin or diesel oil, but consumption was still high - about five to seven miles a gallon.