Vitaly Petrov said he was frustrated with the result of the German Grand Prix, despite returning to the points after difficult outings in Valencia and Great Britain.

The Russian driver was seeking to score for the fifth time in ten races and qualified inside the top ten for the eighth time this season.

With team-mate Nick Heidfeld forced out early on following a clash with Sebastien Buemi, Petrov was left to fly the flag for the Lotus Renault GP team but his strategy worked against him and - having run eighth early on - he was only able to take the flag in the final points scoring position.

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"Well, it's another point gained today, but really we need to analyse exactly why we lost positions out there, and why we didn't come in to the pits earlier to fight with the group in front," he said. "The start was good and I had some decent battles, including with Jenson (Button) and Michael (Schumacher), but the main thing is we need to look at why the likes of Sauber and Force India are finishing higher than us, and correct it as soon as possible.

"We must now concentrate on Hungary and getting some good points there before the summer break."

Team boss Eric Boullier agreed that the result of the race wasn't what Renault had hoped for, with improvements being targeted for next weekend's Hungarian Grand Prix.

"Obviously this is a disappointing day for us," he said. "We had a reasonable qualifying yesterday, which was definitely a step forward from Silverstone, and we were looking to launch a strong assault on the points today from P9 and P11.

"Firstly, Nick was unlucky; after falling back to 22nd position he was ploughing his way through the field and, by the time he moved into 16th place, he was trying to overtake Sebastien but ran out of room and went off-track which cut his race short. Vitaly also had a tough race but stuck it out with a determined drive to come home in P10.

"We are looking to finish much stronger than we did today but, having said that, one point is better than none and we must now look at how we improve in time for Budapest."