Kimi Raikkonen says small mistakes have been costing him a lot of points over the first half of the 2015 Formula 1 season but has confidence in Ferrari that he can secure strong results after the summer break.

The 2007 F1 world champion sits fifth in the drivers' championship, a point off Williams driver Valtteri Bottas in fourth, and has endured a turbulent run of results during the opening nine races. A series of top five finishes, highlighted by second place in Bahrain, were bookended by retirements in Australia (pit stop error) and Austria (crash).

Last time out at the Hungaroring the Finn, who had been running in second after passing the Mercedes pair on lap one, was left seriously down on power by an issue with his kinetic electrical unit and was eventually forced to retire from the race.

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Raikkonen feels it is problems like this which have prevented him from matching his Ferrari team-mate Sebastian Vettel's results but is certain he can stage a fightback later in the season.

"It has been obviously not ideal, it is not a disaster if we are comparing it to last year, but not what I wanted or the results that we have wanted for many different reasons," Raikkonen said. "I know we have the speed and we have everything to do better results, but we keep having a mistake here or there or some odd things happening and that costs a lot of points.

"We just keep having issues or mistakes which we haven't recovered from. We have to get rid of those and I think we have all the tools to make a good result. We just have to do a better job basically. If we can clean up things and make sure we don't have those issues we can get much better results."

The 35-year-old says the Ferrari SF15-T is a vastly more competitive car compared to the Italian manufacturer's 2014 machine and feels it lacks top speed to consistently battle with Mercedes.

Raikkonen's Ferrari team-mate Vettel has been the only driver to continually challenge both Lewis Hamilton and Nico Rosberg this season and the Finn is certain if he can iron out the problems he is capable of displacing the dominant Mercedes duo.

"We have a good feeling during racing and the weekend but sometimes we have an issue and sometimes there have been mistakes and for certain those things cost sometimes," he explained. "The feeling is not the issue. We want to be fast and to be more consistently to really challenge Mercedes. The feeling is okay, we just need more speed."