XPB Images Maurizio Arrivabene admits Ferrari is toying with the idea of having a power unit upgrade for the United States Grand Prix, but says “we have to do our calculations” given Sebastian Vettel’s title bid. The German now occupies the runner-up spot behind Mercedes’ Lewis Hamilton in the standings, courtesy of his P2 finish in last Sunday’s Russian Grand Prix. Ferrari still has four engine development tokens to spend this year but both Vettel and team-mate Kimi Raikkonen have already used their four allocated engines. Thus, any new change will lead to a grid penalty that would nearly dash Vettel’s hopes of securing a fifth crown, as he already trails Hamilton...
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