Red Bull Racing's David Coulthard believes Ferrari and McLaren are still way ahead of the rest of the Formula One field.
The F1 veteran admits he is a little perplexed as to why all the other teams have been outclassed so much by the top two during early-season testing.
Coulthard told Autosport: "I think they have an advantage, yes. A big advantage.
"I don't know why they are doing such a good job and why the rest are not doing one. We all work hard.
"I think what it shows is that in F1 everyone has a wind tunnel and so on, but to make the car work on the track is so difficult. The car moves around on the circuit, and the driver does things like touch the kerbs, and that makes it hard."
The Scot says the way McLaren and Ferrari's chassis works with the tyres could have something to do with their blistering pace.
"For sure, some teams work more efficiently with these tyres in a certain window of temperature, and when it goes hot they struggle," he said.
"It is possible the McLaren and the Ferraris just are working the tyre more. So they get more heat out of the tyre, and out of that they get the laptime."
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