Renault have made some progress in ironing out the engine problems that have blighted Formula One preseason testing, but will head into the season-opener in Melbourne with doubts about "incomplete" preparations. Renault supplies champions Red Bull, Toro Rosso, Caterham and Lotus, and the performance of their new engine disappointed at the tests in Jerez and Bahrain. After managing only 151 laps in Spain, Renault-powered cars spent more time on the track in Bahrain but still finished the 2014 tests with less than half the total kilometres of the four Mercedes-powered teams. Renault were also considerably slower, with four-time world champion Sebastian Vettel's fastest time on...
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