Kimi Raikkonen has said the Lotus has a 'good idea' what to do on Saturday in order improve the pace of the E21 for the German Grand Prix.

Raikkonen was fifth fastest in both practice sessions at the Nurburgring on Friday, his best lap a 1 minute 30.848 seconds, which left him fractionally behind team-mate, Romain Grosjean in fourth - and 0.197 seconds off Nico Rosberg in second.

"We tried quite a few things today; some were good and some were not, so we have a good idea of what to do tomorrow," confirmed the 'ice-man'.

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"Our long run pace wasn't as good as it could have been as we were running with a different setup which would have taken too long to change back during the session, but we now know which setup works better so it's not a worry.

"[As for] the [new] rear tyres, they weren't much different, but we already knew that from when we tried them in Canada."

Grosjean meanwhile was also reasonably happy with his day in the sister car: "We had a pretty good day today," continued the Frenchman.

"We ran the Device in the morning to gather some data then went back to our previous package for the afternoon, where we played with the setup a little but spent most of the time analysing the new tyres.

"We made a step forward with the upgrades that were brought to Silverstone, and we're seeing the benefit here as well. Getting temperature into the tyres can be a bit tricky for us in colder conditions, but today it wasn't an issue which is a good sign. It's only free practice, but the car feels ok so let's see what we can do tomorrow."

"Neither driver was 100 per cent happy with their car today, but we look to be in reasonable shape on the soft tyre and on long runs too," summarised Lotus trackside operations director, Alan Permane. "We've certainly got some more pace to come from the car, so we're hoping for a productive day tomorrow."