Despite struggling with oversteer, Jenson Button says his MP4-29 felt "okay" during Friday's British GP practices.
Although the drivers had to contend with strong winds at the Silverstone circuit, the warmer temperatures suited Button's McLaren.
The Brit, sporting a pink helmet in remembrance of his father John, finished the afternoon's session seventh on the timesheets.
Button's 1:36.228 put him 1.720s behind the pace-setting Mercedes of Lewis Hamilton.
"It's fantastic to be out on the circuit for the first day of the Santander British Grand Prix. To be here on a sunny day, and with a full house, makes it even better, too.
"Our car felt okay today, but we're still trying to find the right balance in the high-speed sections. We're struggling with understeer, trying to get more front-end from the car.
"It's tough out there because it's so windy: this year's cars have less downforce than before, which makes the wings very important. When they're affected massively by the wind, it makes it difficult to get any productive back-to-back results during testing.
"It's proving tricky for us to get the Prime tyre up to temperature, too; as soon as we back off for a yellow flag or for traffic, we can't get it working again. It's very difficult. However, the Option tyre looks good and is able to last for a reasonably long time.
"Nevertheless, it's been a good day. Hopefully, we can put on a great show for all the fans this weekend."