Lewis Hamilton has warned that McLaren's car isn't championship-caliber just yet, while world champion Sebastian Vettel led testing Wednesday for Red Bull to strengthen its status as the early season Formula One favorite. Vettel set the fastest lap yet of preseason testing at the Catalunya Circuit with a time of 1 minute, 21.865 seconds. Teammate Mark Webber was fastest to open the five-day session Tuesday, but Vettel cautioned against putting too much stock into the Austrian team's early results. "It was a good day and a good time, although to be honest it's difficult to say where we are, as the lap times of the teams are all over the place," Vettel said. Hamilton was fourth, a little more than one second behind Vettel, after his session was cut short by an exhaust problem. Read more: http://sports.espn.go.com/rpm/racing/f1/news/story?id=6198337
