Hmm..in the past, under the old format, teams use the old engines from the previous race event (those used in practice/quals/race) sessions for the following week of testings, after giving it an inspection of it's wear/tear. Hence, the increase in mileage the new format engines need to endure isn't as much as what some may want to believe. Even BMW over-estimated the potential lost in horsepower, only to realise it's just a very small dip.
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