Hamilton leads Mercedes 1-2 in Brazil

Hamilton leads Mercedes 1-2 in Brazil

Finnish team mate Valtteri Bottas was second in both and ended up just 0.048 slower.

"Nothing has changed", Hamilton said, when asked if he would treat the rest of the season differently.

"Unfortunately the tyres don't last very long so you only get one or two laps on the short runs".

"We'll see what we get tomorrow".

Hamilton, who accused Renault's Nico Hulkenberg over the radio of risky driving in forcing him wide onto the runoff in the morning, was half a second faster than Ferrari's Kimi Raikkonen before lunch.

"I take so many great memories with me as I prepare for my final two races", said the former Ferrari driver who missed out on the 2008 title to Hamilton by a single point.

Gasly managed just one timed lap, and five in total, before he was sidelined by another MGU-H issue, while Hartley suffered an on-track engine failure during the early stages of the session.

Vettel came sixth in FP1 - behind both Mercedes drivers, his teammate and both Red Bulls - which was followed by a P4 finish in FP2 as he trailed Hamilton, Bottas and Ricciardo.

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"I think overall it's pretty straightforward: Mercedes seems to be the quickest and then it's pretty close between Red Bull and us", he said.

With none of the top four teams able to improve their placings or in any danger of dropping down the order, others were also turning their thoughts to next year.

After losing the title in Mexico, Vettel said he enjoyed getting back in the auto in Brazil on Friday.

Mercedes have clinched the constructors' championship for a fourth successive year and experimented with processes and parts for 2018.

Pierre Gasly and Brendon Hartley took on new MGU-Hs prior to the session, meaning the duo will cop a 10-place grid drop each, and completed minimal running due to further problems.

But Hamilton was blisteringly fast when he switched to the "soft" tyre - more than 0.5secs a lap on average quicker than Bottas, who was comfortably quicker than Ricciardo as the three were all out on track at the same time.

Lance Stroll was 11th for Williams, ahead of Mercedes-backed GP3 champion George Russell, who received his first run out for Force India.