This week's confirmation that the United States Grand Prix deal is done for 2016 has delivered an extra boost to Formula 1 teams, beyond just the positive news of a race in one of the world's biggest markets. For thanks to the detailed wording of F1's Sporting Regulations, removing the uncertainty about Austin on the eve of the new season will mean teams are on course to get another engine for the season ahead. Four engine limit F1 had long been set on a plan to reduce power unit usage over the duration of the turbo hybrid era. Having originally started with five power units for the first year with the new engines in 2014, the rules allowed teams to use just four power units from last...
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