Renault has set itself a cautious goal of 'five wins' in the 2015 Formula 1 World Championship as it attempts to claw back ground on the dominant might of Mercedes.

The French engine constructor powered Red Bull Racing to four consecutive world titles between 2010 and 2013, but struggled to get an early grasp on the new hybrid power units introduced for 2014 with a series of reliability issues and a deficit of power compared with its Mercedes-equipped rivals.

However, Renault heads into the 2015 F1 season with just the two Red Bull teams on its books following the defection of Lotus to Mercedes and the presumed exit of Caterham.

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With just two teams to supply, Renault Sport's Cyril Abitboul is confident this greater focus will enable it to close the margin on Mercedes, even if its expectations don't go too far beyond the three wins it achieved in 2014 with Daniel Ricciardo.

"We estimated there was a gap of about 60bhp with our engine compared to the Mercedes at the end of the 2014 season," he told Canal +. "We hope to close this gap by half from the start of the season in Melbourne.

"Unlike Mercedes, we will start the 2015 season with a new 2015 version of our engine, as well as Red Bull Toro Rosso. Renault's goal is to score at least five wins this season."

Renault's hopes of closing the gap on Mercedes are pinned on the much discussed 'engine unfreeze', which will see teams granted 32 'tokens' worth of upgrades on the existing engine. To date, Abitboul says Renault has used most of its tokens so far.

"To date, we have used about two-thirds of allowed tokens (32) to change our engine this year. "

Pre-season testing gets underway in Jerez in February 1st.