LEWIS HAMILTON is unsure as to why Mercedes have quickened up in their last two races.
The Brit, 36, was victorious in Sochi a fortnight ago.
While team-mate Valtteri Bottas took home first place in Istanbul last weekend.
Asked why Mercedes have improved in recent weeks, Hamilton was perplexed.
He said: “We haven’t done anything to the car so I don’t really know why that is the case.
“I think the two tracks that we’ve just driven on have maybe suited us a little bit more.”
Six-time world champion Hamilton currently trails rival Max Verstappen by six points in the driver’s standings.
But Mercedes have a healthy 36 point lead in the constructor’s title race.
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Hamilton continued: “The car has been feeling good.
“It felt great this weekend and moving forwards, Valtteri did a great job.
“If he can continue to perform like that over the next races, it will be good for the team and if the car continues to behave as it has this weekend, that is good for us.”
The season continues in Austin, Texas this Sunday.