Red Bull team boss Christian Horner insists not too much should be read into the testing times, but is nevertheless "content" with how the RB8 has performed so far.
Sebastian Vettel kicked off the second pre-season test in Barcelona with the fastest lap on Tuesday, but it is still very much a cat and mouse game as most of the teams claim they are "just collecting data".
Horner is happy with Vettel's start at the Circuit de Catalunya, but says it's all about the mileage at this stage of the season.
"As you say the times mean very little," he told Sky Sports News.
"We are trying to work through a programme and gather as much data and information on the car as we can and give the drivers as much of a feel as they can.
"Sebastian's now effectively half-way through his testing - before Melbourne he's only got three days left - so we'll focus on some other bits and pieces tomorrow and then hopefully go into that final test armed with even more information."
He added: "I think at the moment we're content, but you always want more. You always want more laps, you never have enough time in the day - especially with the testing being so condescend this year.
"It was a cold start this morning so that plays a little bit of havoc with these cars, they don't like running in very cold conditions. And, of course, there's not many tracks were we run at where it will be two or three degree track temperature.
"But it's the same for everybody so it's just about gathering as much information as you can and running through the different programmes that the engineers have set themselves."
Mercedes' new car, the W03, made its public debut on Tuesday and Michael Schumacher posted the sixth fastest time.
After two consecutive fourth-place finishes, the Brackely-based squad are looking to put up a better fight against Red Bull, McLaren and Ferrari this season.
Horner says they won't take Mercedes lightly.
"They're a good team; they've got some good people there, so it would be foolish to underestimate them. But the stopwatch never lies, so we will see when we get to Melbourne where the pecking order is," he said.
"And then of course the development in Formula 1 is such that it doesn't stand still; it will be a race all through the season to get performance on the car and I'm sure there will be swings and roundabouts for all the teams."
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