Timo Glock topped the times on a fog-hit first day of testing at Sakhir in Bahrain on Tuesday, with little to separate the runners on the timesheets.
Although the three teams present - Ferrari, BMW Sauber and Toyota - had all given up on running in Europe because they wanted to be sure of good weather, the first two hours of the session had to be abandoned because of fog.
Once the medical helicopter was in place, however, the teams were able to complete a great deal of running - which came as welcome relief to the outfits who have been hit by poor weather conditions up to now.
Glock was fastest of the three cars present, and was happy with what the team had found on the first day spent focusing on set-up work.
"After the weather intervened during our Portugal test, this was our first real chance to give the TF109 a run in dry conditions," he explained. "The fog held us up briefly at the start but it wasn't a major problem. We did a lot of set-up work and in the end we found a good direction.
"The car felt quite consistent so this is already a positive sign. We got through a lot of laps so this was an encouraging start to the test."
Felipe Massa was second fastest for Ferrari, just more than one tenth of a second adrift of Glock's best. The Brazilian spent the morning evaluating set-up work to get his F60 dialled into the Sakhir circuit, before switching to long run efforts in the afternoon.
Robert Kubica was the only other driver present, as he set the third best time after a day also spent working on set-up. His afternoon was interrupted by a mechanical problems but he was satisfied with the progress they put in.
"It was the first time I was able to drive the new car in warm weather," said the Pole. "We learned a lot about the car's behaviour in these conditions, so overall it was a good day."
Pos Driver Team Time Laps 1. Glock Toyota (B) 1:33.501 82 2. Massa Ferrari (B) 1:33.615 98 3. Kubica BMW-Sauber (B) 1:33.702 95 All Timing Unofficial