Renault Sport director of operations Remi Taffin says he is satisfied with the engine firm's efforts during pre-season F1 testing, though he admits he is uncertain where customers Red Bull and Toro Rosso stand in terms of performance. The engine manufacturer has focused much of its winter attention on bringing the latest generation power unit up to a reliable standard in an effort to avoid a repeat of the disastrous pre-season programme twelve months ago when its customer teams came into the season with relatively little mileage. To that end, Renault is content with the progress made, despite issues with the ERS on the Red Bull striking on the final day of action. However, this eagerness...
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