Sebastian Vettel says he would be surprised if Mercedes can make “huge progress” from its anticipated Formula 1 engine upgrade at this weekend’s French Grand Prix.  Mercedes suffered a setback at the Canadian Grand Prix when it was forced to postpone its planned power unit update after a last-minute “quality issue” was discovered, though the reigning world champions are expected to move onto its second-spec 2018 engine at Paul Ricard.  But Vettel, who was boosted by Ferrari’s own engine upgrade as he dominated in Montreal to replace Lewis Hamilton at the top of the drivers’ championship, doubts Mercedes’ new power unit will make all the difference in its bid to return to...
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