Formula 1's brave new world starts this week, when 10 of the 11 teams take part in a private test at Spain's Circuit de Barcelona-Catalunya.

Formula 1 has completed day one of its highly secretive first day of preseason testing -- a day so secret that even each team's quickest lap times have been hard to come by.

Antonelli also praised the driveability of the new Mercedes power unit, which "was a big question mark but seems to be good so far."