Lewis Hamilton admitted that he is bemused by his own disappointing recent race form after finishing seventh in Sunday's Abu Dhabi Grand Prix.
His Mercedes team-mate German Nico Rosberg came home third.
Briton Hamilton said: "Even if I was ahead, I would have been overtaken, I just wasn't good overall.
"It was like I had another 50kg in the car, I was just too slow. Just no pace.
"Ultimately I am not particularly happy with my performance, but I am very happy with the team's performance.
"The development and hard work that has gone in has been remarkable. For whatever reasons, maybe being a new car, I have not got on well with it.
"And really it is for me very, very confusing. I was half a second up on my qualifying lap, 100 per cent, and if I hadn't made a mistake and been on the front row, the position would have been different.
"But still, when I get to the race I don't know what happens. I really struggle. For a lot of races it's been like that."