Renault revealed that they are making 'promising progress' to their power units ahead of this weekend's Spanish Grand Prix.
Red Bull, the reigning Constructors' Champions and leading Renault-powered team, have languished behind Mercedes so far this year, with the Brackley outfit opening up a 97-point advantage over their Milton Keynes rivals after just four grands prix.
While the Mercedes power unit is undoubtedly more powerful than the Renault counterpart, many of the European tracks are less power dependent, which could help the likes of Red Bull close the gap to pace-setters at the top of the standings.
"I would not say optimism, as we are still on realism," Renault's Head of...
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