Romain Grosjean believes he has "improved massively" during a tough 2014 season with Lotus.

After a strong end to 2013 saw him scoring podium finishes on a regular basis, Grosjean has endured a much harder year this season in an uncompetitive car which has limited him to just eight points so far. However, having signed to stay with the team in 2015, Grosjean says he is certain it will be a more productive year because both he and the team are stronger for the experience.

"It's easier to say than to do, but I firmly believe that you always learn much more from difficult rather than easy situations," Grosjean said. "Not only has the team learnt an enormous amount this season, but I think I've also improved massively. Two years ago I'd probably have dealt with this situation completely differently but I've managed to stay composed.

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"I'm looking forward to seeing us work hard and develop during the winter. We all now have a much clearer picture of what we are focusing on and avoiding in terms of plans for the E23. We've been working on it for quite some time and things seem positive, so I really hope when I get in the car at pre-season testing I get that special feeling when you know it's going to be a good season.

"I'm not saying we will be back at our 2013 levels when we were extraordinarily good for the size of our budget that we had. Personally, I am hoping we can challenge the front runners, score a few podiums and points and get back into the top five in the Constructors' Championship and I want to taste champagne with the team again!"