Vijay Mallya says Force India need to better understand the new Pirelli tyres if they hope to stay ahead of McLaren in the Championship.
Ten grands prix into this season and Force India are fifth in the Constructors' Championship, two points ahead of their Woking rivals.
However, their advantage could have been greater had they not suffered back-to-back grands prix outside the points.
And team owner Mallya believes issues linked to the new Pirelli tyres meant his drivers were not able to get the most out of their cars even before hydraulic failures blighted their Hungarian GP weekend.
"We've spent a lot of time, energy and resource understanding these tyres, which have played a very important part this whole season," said the Indian businessman.
"We obviously were on top of it, because that is reflected in our performance. Halfway through, we're still ahead of McLaren, we're still fifth in the Constructors'. That's because of our performance in the first half and the points we've scored.
"The trouble in Germany as well as here, after the change in the tyres, is because the drivers have not been as comfortable. In Budapest, particularly Paul has been uncomfortable with the tyres all weekend; it has shown in his performance and his timing.
"Adrian, on the other hand, has got the tyres to work for him. He qualified in 11th spot and would have made Q3 by 0.02s - which is unlucky, but it happens. It was by the smallest of margins.
"The way he was running [in the race], had he not suffered that unfortunate hydraulic failure, I would have predicted that he would have finished in the points.
"It's not right to admonish the car. The car is fine. It's just that the tyre change needs better understanding. It's working for Adrian at times and not working for Paul. We need to just smooth this out, get a better understanding of the tyres and move forward."
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