Nico Rosberg is expecting a challenging final race of 2015 in Abu Dhabi due to the high mileage on the engine powering his Mercedes W06 Hybrid.
Rosberg suffered a failure in Italy and Mercedes had to re-assess his engine situation, though despite the usage on his current specification he was able to top the second session at the Yas Marina Circuit.
"It's been a good start here in Abu Dhabi - but it will be a tough weekend for me as I have quite a high mileage engine in my car," he said.
"After the Monza problem, we have had to stretch the engine life more than we had planned over the 19 races, so I definitely have a small lack of power on the straights and therefore need to make up extra time in the corners.
"It will be a big battle with Lewis [Hamilton] here. He didn't really bring together his quick laps, so it will be even closer tomorrow I'm sure.
"I'm looking forward to it and I definitely want to win this race and give the boys in the garage a reason to celebrate at the end of the season."