The decision when to change focus to 2014 development is "difficult" according to Mercedes' Nico Rosberg.
The Anglo-German team is enjoying it's most successful season since it joined the F1 grid in 2010 with Rosberg claiming two wins and Hamilton a solitary win last time out in Hungary.
Despite that Rosberg finds himself a massive 88 points behind Vettel in the championship while Hamilton is back in the championship hunt 48 points behind the German with nine rounds left.
With the new regulations coming for 2014 Rosberg in particular is unsure what Mercedes should do; continue developing the W04 in a bid for more wins and poles, or switch focus to the 2014 car to try to be in the best position possible heading into the new era.
"Unfortunately, especially due to the tyres, we were not consistent enough. The progress we have made, however, is huge," Rosberg explained. "But our goal is to be where Sebastian (Vettel) is."
Nico continued admitting the 2014 rule changes are a "huge opportunity" for a team like Mercedes.
So should Mercedes switch focus now?
"That's a difficult question," Rosberg said. "I'm in two minds. On the one hand, I find it so cool to come to a race weekend with the best car, thinking 'I can put it on pole and win'. It's a great feeling.
"On the other hand, half of me thinks next year is such a huge opportunity, because of all the changes. If we just keep driving what we have now, we can still get some good successes out of this car," he added.
In other words Rosberg believes his team would benefit more from switching attention to 2014 sooner rather than later.
Team boss Ross Brawn admitted that is a possibility.
"For Spa and Monza we have some great update packages in the works," he revealed. "Depending on how well things go, we will then decide what to do for the rest of the season."
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