In the 1983 British Grand Prix, the first Cosworth-powered car was in 13th place on the grid, all the cars ahead of it being powered by turbocharged engines. Fuel consumption of the turbos was heavy and refuelling mid-race had become necessary. With the ever-increasing power, speeds were continually on the up and in practice René Arnoux became the first person to lap the circuit in under 1:10.000 with a time of 1:09.462 in his Ferrari 126C3, a lap at over 150 mph. In the race, the lap record was raised to over 140 mph by Frenchman Alain Prost, who won the race in the Renault RE40 at an average speed of 139.218 mph, from Nelson Piquet in the Brabham-BMW BT52B and Patrick Tambay in a Ferrari. Finishing fourth, also using Renault power, was the Lotus 94T of Nigel Mansell.