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Nico Hulkenberg believes that this year's Williams does not currently have the speed to match the pacesetters at this week's Barcelona test.
The reigning GP2 champion finished the first day of testing with the second fastest time, but his best lap of 1m22.407s was nearly one second adrift of Mark Webber's Red Bull.
Hulkenberg believes that Williams is part of a second group of teams slightly behind Red Bull and Friday morning pacesetter Ferrari, and unlike some other teams he is not convinced that it is possible to match their pace.
When asked if the FW32 was capable of matching the fastest times set so far at the test Hulkenberg said: "It's difficult. I think not quite, but we are not so far away.
"I think Ferrari and Red Bull are just a little bit faster everywhere. Then there is a drop down, with teams like us, McLaren, Mercedes, Renault, but it is so difficult to read.