Kimi Raikkonen has described his 2015 form as "pretty average" and a "long way from what it should be" ahead of the F1 season finale in Abu Dhabi.

Raikkonen return to Ferrari in 2014, but has still yet to win a race in his second spell with the Maranello-squad and while this year he has got on the podium, he has only managed it twice, when was second in Bahrain and third in Singapore. Team-mate Sebastian Vettel, in contrast, has won three races - and scored 266 points in total, almost double that of Raikkonen on 135.

"Pretty average, I must say," Raikkonen replied, when asked to assess his year.

"Better than last year but a long way from what it should be, but that's life and next year we will try again."

Asked if Bahrain has been his best since returning to the Scuderia, the Finn added: "The end result was probably best but it doesn't mean that we are somehow better than other weekends. The end result, it just looks good. But it's not been the easiest few years but that's how it goes, y'know?

"We improved a lot from last year but we're still not happy and when I don't finish five races it's quite a big... many races out of how many we've done so far this year. You don't expect to be very high up and fighting for a lot [if that happens]. So, we have to improve and I'm sure we can still improve it and next year is a new challenge. Let's see.

"I'm sure we can do better."

Looking to 2016, Raikkonen is confident Ferrari will be strong, just not how strong and is uncertain if they will be able to dethrone Mercedes.

"Obviously this year has been much stronger year than the previous year and that's easy to see whichever way you look at it. When it comes to next year the aim is to always be at the front and Mercedes is still very strong and everyone else is going to try to beat them. Is it going to happen next year, are we going to be in a position next year?" he pondered. "We hope so, at least.

"But we have to wait until we put the cars on the circuit in the test and the first few races and then we will know where we are. There's been a lot of work being done at the factory, numbers and stuff, but it's never the same until you're on the circuit and you can see it well or feel it whether it's going to be a good one. I'm sure we're going to have a strong package, but is it strong enough?

"Time will tell."