Mark Webber says a lack of full wet tyres played a huge role in him opting not to do any serious running at Silverstone on Friday.
Under this year's regulations, all drivers have just three sets of full wet tyres for the entire race weekend.
Given that it is expected to rain on Saturday and Sunday, this meant teams were careful about using the blue-striped Pirellis in Friday's practice.
As a result, Webber covered just seven laps on Friday morning with a best time of 1:58.463.
"The conditions are pretty dodgy to say the least," he told Reuters in the break between sessions.
"We don't want to do a thousand laps today because the forecast looks pretty dodgy for the weekend and we need these tyres."
However, instead of doing even close to a thousand laps in second practice, Webber opted for just one.
With the conditions worsening and the tyre situation, only four drivers bothered to put in a lap in the first half of the session.
But with the conditions improving into the second half, Webber opted for just an installation lap before bringing his RB8 back into the pits and parking it.
His team-mate Sebastian Vettel was 13th quickest.
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