Jenson Button says he would still like a focus paid to improving the performance of his Honda engine, even if he is pleased with the gains made on the reliability side.

The 2009 world champion, who earlier this month confirmed he would be staying with McLaren next season, has joined team-mate Fernando Alonso in being critical of the Honda power unit's performance disadvantage compared with rivals.

However, following its much publicised struggles with reliability during pre-season testing and early on in the year, Button acknowledges that strides in this area have at least been impressive, even if he admits it is still lacking compared with the likes of Mercedes and Ferrari.

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""We're still nowhere near as far as we need to go with the engines, but my last two engines have done 1,500 or 1,600 kilometres and if you look at it an engine needs to do 3000 kilometres in a season to use four engines. We are still a long way off that, but it is an improvement from where we were and we can at least get to that mileage.

"Here I have an engine that is a lot younger than that, the last one was 1,600 and this is much younger. I don't know when we are going to push it further to see how many kilometres it can take, I'm not sure when that is going to happen."

Despite this, Button still wants a push for performance, saying he would rather retire from the lead than finish down the order.

"You'd always take power because that's the most difficult thing to achieve. That's what we love because we are racers. We are not here to do a 24-hour race, we are here to be fast and that's what we love. You'd much rather retire in the lead than finish tenth."