Sauber Driver Kamui Kobayashi Fastest Driver on Day 4 of F1 Testing

Sauber driver Kamui Kobayashi was the fastest driver at Catalunya during the last day of the second round of Formula 1 testing. Fastest driver yesterday, Pastor Maldonado, was second fastest today. 

Marussia had a suspension problem today that meant it could not test at all today. Marussia is set to reveal its new 2012 car during the final Formula 1 test at Catalunya in early March. Until now, it had been testing using last year's car. 

This ends the last day of the second round of Formula 1 testing. The fastest times during the week dropped by about a second since Vettel's fastest time on Tuesday. The number of laps done by each driver stayed pretty consistent throughout the week. Except for today, when most drivers did over 100 laps. 

Source: Autosport