"I think we have a very good car, we proved that in the first race and also in Shanghai we were very quick but I wouldn't say it is the quickest car," Button said. If you look at the last race, it wasn't the perfect weekend for us but we basically weren't fast.
"The Lotus and the Red Bulls were a second quicker than us so I don't understand why and no one else in F1 understands knows why it is such a change around but I don't think they have a car that is a second quicker than us."
"I think it is circuit dependent and I also think that the conditions make quite a big difference, I know we always talk about tyres but the conditions make quite a big difference as to whether you can get the tyres working on a particular car.
"It is very difficult to understand at the moment who is quick. You would say at Melbourne and China it was us and Mercedes and at the last race it was Lotus and Red Bull.
"I have never been in a situation where there are so many teams fighting for victories at different circuits.
"So I wouldn't say that our car stands out compared to the competitors and we say that you are only as good as your last race and you would say now that the Lotus and the Red Bull are the cars to beat."
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