Caterham driver Vitaly Petrov has said that the team is mindful of the wet weather forecast for Sunday's Grand Prix.
Caterham need a twelfth place to claim tenth in the championship back from Marussia.
"I think we made some good progress in both sessions and I’m reasonably pleased with where we ended up. In the morning session we ran both the development tyre and the prime we have for this weekend and have a lot of very good data from both", he said.
"We also tried a couple of different aero configurations which gives us options for this weekend, particularly bearing in mind the chance of bad weather on Sunday. In the afternoon we were looking at fine tuning the setup on long and short runs – we have more to do to get the best out of the harder of the two compounds but the car felt pretty good on the options and we can get even more out of them for the rest of the weekend".
If it's dry, Petrov expects a two or three stop strategy.
"One thing that was immediately clear was how high tyre deg is going to be here. It’s completely different to last week in Austin where one stop was the obvious choice – if it’s dry here on Sunday it’s much more likely to be two or three stops so tyre management is going to be key".