Sebastian Vettel says his running in Friday practice for the United States Grand Prix was focused on being able to recover from a pit lane start.

Red Bull has changed the whole power unit on Vettel's car - his sixth of the year - which automatically results in a penalty forcing him to start from the pit lane. With his qualifying time now pointless, Vettel did no running on low fuel and was slowest in FP2 and said he was setting his car up for the race despite suggestions that he has a duty to qualify as the reigning world champion.

"The rules are the same for all of us," Vettel said. "It doesn't matter where you finish the year before, you have to obey them. For sure it's not great knowing that you can't take part in qualifying so it's different for us but we knew it from the start so we focus today as well on preparation and trying to come back from the pit lane."

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And Vettel also said his running wasn't completely smooth but said he was able to recover across the two sessions.

"It was a different practice today, as we focused on Sunday preparation. We had an issue with the gearbox this morning so we lost some time, but overall it was okay."