Wednesday 17 December at 12:00 : Dec.17 (GMM) Sebastian Vettel has played down Red Bull's recent dominance of formula one testing time sheets

The cars fielded this winter by the energy drink company's two teams, and particularly those driven by the Swiss rookie Sebastien Buemi, have often set the pace

But it must be noted that while most other teams have been experimenting with the new aerodynamic rules for 2009, the Milton Keynes-designed cars have usually been running 2008-specification cars with the grippier slick tyres

"We have to wait until everybody is out there with their new cars. Then we can start seeing how we compare," Vettel, 21, told The Sun

The 20-year-old Buemi, however - who is hoping his appointment with Toro Rosso next year will be confirmed before Christmas - has undoubtedly been impressive

When the Monza race winner Vettel occupied an identical RB4 at Jerez on Tuesday, he ended the day a few tenths slower than Buemi

"Of course I am pleased that I was faster," he told the Swiss newspaper Blick