Renault introduced an upgraded power unit for the Barcelona in-season test on Tuesday in both its own car and customer Red Bull, with both drivers confirming it is a 'step forward' on the previous spec. The French manufacturer is hopeful of closing the gap to Ferrari and Mercedes with its latest developments and it's believed the new engine could be worth around three to four tenths of a second per lap, depending on the circuit. Renault third driver Esteban Ocon believes the improvement they've made with the engine could surprise some. 'You will be surprised,' he said after completing 105 laps. 'It is really good. Really good. I can tell it will be quicker for sure.' Ricciardo...
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