Felipe Massa has admitted he has been "impressed" with his switch to Mercedes power for 2014.
It is the first time in his F1 career the diminutive Briton has not been powered by a Ferrari engine.
The Mercedes team, and its customers McLaren, Force India and Massa's new employer Williams, are tipped to lead in 2014 with a superior 'power unit' for the new turbo V6 regulations.
"I went to the (Mercedes) factory and I was impressed," Massa is quoted by Italy's La Repubblica.
There are rumours Mercedes has come out so strong in 2014 because the German carmaker has invested four times more money than Ferrari.
"I don't know whether it is four times," Massa said,...
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