Nico Rosberg says it is "difficult to predict" where Mercedes are in the pecking order after running the revised Pirellis on Friday in Germany.
Fresh from his victory at the British Grand Prix, the Mercedes driver continued to show impressive pace finishing second in both practices.
Just 0.235s down on Championship leader Sebastian Vettel in the afternoon's session, covered 63 laps in total on Friday, giving him time to evaluate the revised Pirelli tyres.
After the Silverstone failures, Pirelli have not only introduced the Kevlar-belted tyres that the drivers tested in Canada but also banned tyre swapping from this weekend onwards.
And the changes took some getting used to.
"It was an interesting day for us as we had to adapt to the new tyres," said the German.
"They are different and require a different set-up, so today was a good opportunity to learn something.
"We want to understand them quicker and better than the other teams."
As for his team's performances, the 28-year-old is not willing to take a guess saying there are too many variables to take into account.
"Generally it seems that we are quick again over one lap and the long run was not bad.
"It's difficult to predict where we are, because you never know exactly about the fuel levels of the others.
"Also it's going to get warmer on Sunday and this could change also the whole picture again."
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