Sebastian Vettel says he would be very surprised if Mercedes were able to make "huge progress" with its engine upgrade. A decision is still yet to be made if Mercedes will unleash their engine upgrade this weekend in France. Vettel, who now sits at the top of the drivers' championship, had his Ferrari engine upgrade in Montreal and consequently won the race. The German driver says that he doubts Mercedes' engine upgrade will make too much of a difference. "If you look at the power units, obviously we don't have that many chances to introduce new engines, and even if we had it's not that easy to make progress," Vettel explained to Crash.net. "I'd be surprised...
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