Jenson Button says the upcoming Belgian Grand Prix will provide McLaren with potentially the clearest indication yet of where its cars compare with its rivals on level terms.

Fresh from the team's best results of the season in Hungary, which saw Fernando Alonso finish fifth and Jenson Button pick up points in ninth, the Englishman admits the Hungaroring's lower dependency on engine power goes some way to skewing its general form.

As such, Button believes the Spa-Francorchamps circuit, with its mix of straights, fast bends and slow corners will provide a truer gauge of where the Honda-powered MP4-30 is realistically positioned in the F1 hierarchy, particularly once its much vaunted new upgrades have been applied.

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"I think Spa is a very good test for us and for many other teams to compare themselves to the lead cars," he said. "It is a fast circuit, but it is also a circuit where you need good aerodynamics for the high-speed corners and it is a great circuit to compare yourself.

"We will have a good step forward on the Power Unit, which is great, and in terms of the car, we will see how it works."

"But there is still a long way to go with the car. Every area we need to work in. You look at the Red Bull, it is very strong in Hungary and previous races it was not. Either they have made a good step forward or it shows power is less important there than other circuits."