Webber finished in fourth place on Wednesday, having completed 101 laps.
"I think in terms of consistency it’s great," he said. "I’m very happy with the car and myself."
"I might have bombed a few laps here and there, but I’ve done 170 or more, which is a good total for the first two days with a new car. Overall, it’s been very good. The car gives me the confidence to push pretty hard and that’s always an indication that you have something you can build on.
"The run plan this morning was pretty ambitious, but we have a lot of departments in the team looking for feedback, so it was important to get through the list. We accomplished most of it and that’s all you can ask for. People always ask about the times being done up and down the pit lane but, to be honest, I haven’t looked. We can only look at what we’re doing, and so far we’re satisfied with where we are.
"We’ve learned a lot more since yesterday and I’m sure that will continue tomorrow with Sebastian. I think we’ve put the car in a good position for him and hopefully he’ll be able to push on from there. If you ask me where I think we are compared to this time last year, I’d say we’re in a better position, but of course a lot of that is down to a lack of regulation changes."
World champion Vettel gets his first run in the RB9 tomorrow.