Nico Rosberg is refusing to get carried about by his latest P1 conceding that being the fastest on a Friday doesn't mean much.
Rosberg is currently riding on a high having claimed his maiden F1 pole position and victory last time out in China.
And although it was much hotter in Bahrain on Friday with the track temperature sitting at 40'C, he was once again quickest.
The Mercedes GP driver, armed with his W-duct wing, posted a 1:32.816 to edge Mark Webber by 0.446s.
"That was a good start to the weekend, and whilst it's nice to be quickest today, we know that doesn't count," he said.
"The most important thing still is to improve our race pace.
"For the moment, it looks reasonable but we need to analyse where we are on high fuel levels compared to our competitors and draw our conclusions.
"The conditions are really tough out there, so the race will be quite demanding from the tyre perspective."
As for his team-mate, Michael Schumacher was fifth quickest on Friday, 1.046s off the pace.
"We started well today, and our long runs are satisfying as well as our overall times. Unfortunately I could not complete my fast lap properly due to traffic.
"We will have to see what the outcome will be tomorrow and on Sunday as the tyres go away very quickly. You really have to stay within the limit of them, that's going to be the main issue.
"Let's see what we can make out of it but the start of the weekend has definitely not been too bad for us."