Valtteri Bottas is pleased with his start to the weekend but knows there is "work to do" ahead of Sunday's race at Silverstone.
The Finn was quickest in both practice sessions on Friday, with team-mate Lewis Hamilton keeping in very close touch as he tries to revive his title challenge.
"We've started the weekend really well," Bottas said. "In the first session, the balance was not too far away, so a positive start.
"There is still work to do to get the car more driveable and to be able to trust it more in the high-speed corners"
"But overall I think it was a good start for the weekend.
"We just need to work as normal, try and make improvements for tomorrow."
Bottas was also impressed with how the 2017 cars have taken to the Silverstone track.
"I'm impressed by the new cars on this track with its high-speed corners," Bottas said. "They're so much quicker than before.
"You feel more G in the corners. There's a greater effect on your body, quite a big step up from last year. But luckily I'm well prepared for that.
"I'm definitely enjoying it and had a lot of fun, so I'm looking forward to tomorrow.