Lewis Hamilton: "We've made a few changes to the balance of the car since the last race and I'm much happier - but we'll still be making changes to improve our long-run pace, which can always be better. I went wide a couple of times on my long run in P2, and looking after the tyres will be a tough call in the race – so it's all about finding the right balance. Around here, overtaking will be a little more possible than in Melbourne. Nevertheless, starting from the front will still be the best position for the race, and that's what I'll be going for tomorrow."
Jenson Button: "The morning was a little frustrating: we had an oil leak which cut my session short, but it didn't really matter as the track was still dirty. In the afternoon, I did some positive running on both tyre compounds – I think we have a good understanding of the tyre. But it's going to be tough on both compounds around here with all the humidity and the heat."
Sebastian Vettel: "I would love to be a bit higher up this afternoon, but all in all we had decent running today - although there is still a lot to do. The tyres drop off quite quickly here, which is the same for all the drivers, but I think we are sliding quite a bit and I would like the car to be a bit more stable."
Mark Webber: "We got through our whole program today, which was good and P1 and P2 went smoothly. Obviously it's a different venue altogether to Melbourne, so understanding the tyres is important here. The rain held off, which is always fortunate and we have plenty of work to go through regarding our car set up and the tyres."
Fernando Alonso: "As usual here in Malaysia, one of the main tasks on Friday is to get used to the extreme conditions as quickly as possible. Especially in the garage, you suffer from the heat when you are inside the cockpit, while at least out on track, you get a bit of air, although you can hardly call it cool! This morning we did a lot of work on comparing different aerodynamic configurations, which was a bit like putting together a puzzle, trying to find the best combination."
Felipe Massa : "We are suffering with instability at the rear, especially in the slow corners. There are so many things we didn't understand and now we are starting to understand everything.We don't have a very competitive car but I hope that we can fight for as many points as possible. I want to get in the car with everything right, the best we have. And that will be tomorrow."
Nico Rosberg: "We've had a decent start today at one of our home races here in Malaysia so I'm quite happy. We learned a lot about how to use our tyres, and I feel things are going in the right direction but I don't know where we are compared to the others."
Michael Schumacher: "We had a good day on track today, and I am very happy about the work that has been done since Australia. This has enabled us to achieve reasonably consistent long runs which is obviously important in these conditions. Saying that, we also know that everyone works on different programmes on Fridays, so I would guess we have not seen everything yet."
Kimi Raikkonen: "It was an okay day but we still have work to do on the set-up. The steering was a small improvement but we are still working in this area. I feel fine in the car in the hot conditions, and the race will take place later in the day so I don't expect that to be a problem. I hope we will make some progress tomorrow as the car is quicker than we've shown. Having an issue with the KERS in the afternoon was frustrating but I'm sure we'll have it fixed for tomorrow."
Romain Grosjean: "In the morning there was something not quite right with the rear of the car which was soon sorted, then in the afternoon I picked up a cut on one of my tyres. Neither was a major issue. We looked at dealing with the heat and finding a good set-up for the high track temperatures here."
Paul Di Resta: "There was an issue with one of the brake discs in the afternoon session, which probably looked more dramatic from outside the car, so the team made some changes before I started my long runs on the medium tyre. It's always difficult to read too much performance-wise from a Friday, but I would expect the midfield to be very competitive once again this weekend."
Nico Hulkenberg: "I think we learned quite a lot and the car feels totally different compared to Melbourne because of the track characteristics and the hotter conditions. The set-up work we did is promising for tomorrow and the long runs have given us lots of useful data, which was something we missed out on doing in Melbourne."
Kamui Kobayashi: "It was the first time we have used the 2012 tyres in such high temperatures and the degradation is quite significant. Probably this had an impact as well, but in any case we struggled with the balance of the car quite a lot today."
Sergio Perez: "It was a difficult day in terms of setting up the car and getting the balance right. It was better on long runs than on single laps. We managed to achieve some improvements for the second free practice and now we will be looking carefully at the data tonight."
Daniel Ricciardo: "I've driven here before in Formula BMW, but when you switch to a Formula 1 car, the notes go out the window! But all the same, it helps to have some previous track experience. The simulator work has probably been more useful to me. The track is quite technical and I think we made a good step forward this afternoon, compared to the morning which was quite difficult."
Jean-Eric Vergne: "Since last year, I've driven the track at the simulator a lot, but they don't have the heating turned to maximum in Milton Keynes. Overall, I think today went well for us, I had a strong long run this afternoon, when my pace was good and Daniel's lap time shows we have a good car."
Pastor Maldonado: "We've had a good day of running in Malaysia. The team have done a great job and we completed our test programme without any problems. The car looks consistent."
Bruno Senna: "We had more work to do this afternoon having not run in P1, but our pace on longer runs looked good. We still need to improve throughout P3 tomorrow morning, but we have a good direction to go in."
Heikki Kovalainen: "I think today proved what we suspected, that managing tyre degradation is going to be critical to performance on Sunday. This morning we tried a couple of setup options that didn't really work too well but we made some changes over lunch and straight away this afternoon the car felt better. I had more grip and was able to manage the tyres well over the second run we did."
Vitaly Petrov: "The grip levels this morning were not good, but I think that was the same for most of the teams, but this afternoon we had found some improvements, even though the track itself had lost some of the grip from this morning. We have a couple of areas to focus on tonight, particularly looking at maximising traction."
Timo Glock: "Our programme meant we had to do a lot of work on the car and the guys were constantly on the 'go'. We still have some way to go; the car is not perfect yet by any means. We have however made a lot of progress so we need to keep this up for tomorrow."
Charles Pic: "We had a big programme to work through to put the car through the track testing we are catching up with right now, but the results have been very positive and I am happy with the steps we have brought to the car."
Pedro de la Rosa: "Today has been a positive day for us because it panned out with the normality of a practice session day, and that in itself is good news. For the first time we were able to try out different solutions on this car: the DRS is working, the power steering has improved from Australia and, although we're not where we would like to be, we've taken a considerable step forward."
Narain Karthikeyan: "In the morning session we suffered some reliability issues, the same as in Melbourne but not as bad and we've also got some cooling issues too. In the afternoon these issues persisted on turns 13 and 14 where I wasn't able to select the gears properly but the important thing is that we're within the 107% time and can continue to improve and be in better conditions."