Nico Hulkenberg declared himself content after practice for the Malaysian Grand Prix but remained wary about the state of the tyres.
Hulkenberg rounded out the top 10 in second practice but feels that Force India has work to do with regards to the tyre wear.
"I think we can be satisfied with what we learned today," he said.
"We worked through the programme and there were no big issues on my side. Of course, the hot weather here means conditions are tough and we found that tyre management during the long run was quite challenging. It’s even more difficult this year because there is more wheelspin with these engines and the rear degradation is quite high.
"We collected the usual data for the tyres and the set-up, and I think there is still room for improvement. I need some more grip and we need to tweak the balance before final practice."
Force India team-mate Sergio Perez encountered mechanical issues in FP1 but was able to get back on track for the second session.
"Not an easy day because I missed most of the morning session and that has limited my running on the hard compound," he said.
"In the afternoon we tried to improve the car, as well as learning about the tyres, but I still feel we need to make a big step tonight to be ready for qualifying. The tyre performance gap between the hard and the medium compound is not that big, but we suffered with high degradation on both tyres."