The United States Grand Prix poses a serious challenge for reliability at this stage of the season, according to Renault's Remi Taffin. The event is particularly straining on the power unit and its hybrid systems, and with just three races left and many drivers having used up all their allowed spares, penalties could begin to play a role in the race outcome. "Now we enter the final three races, reliability starts to become an overriding concern so having such a challenging circuit at this point in the year makes everyone a little nervous," said Taffin. Sebastian Vettel is all but guaranteed to use a sixth Internal Combustion Engine for the race and will likely start toward the...
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