LONDON - World champion Sebastian Vettel set the fastest time of the week as he gave a powerful display on the final day of F1 testing at Silverstone on Friday. Red Bull star Vettel completed a total of 78 laps with a best time of one minute 32.894 seconds. "We had three days of testing with a lot of different drivers in a lot of different cars and no failures -- in conditions that were hotter than the British Grand Prix -- so that's good," Vettel said. "Obviously, we were very limited on what we could do, but for me there is not that much difference with the tyres. It was good to get in some laps though, good to get a feeling for them and it's always nice to drive at Silverstone." Adrian Sutil had set the best time of the morning running for Force India, and he ended the day second-fastest. –AFP