The practice sessions are also used to verify fuel consumption and the precise relationship between fuel loads and lap times. These vary from track to track. A circuit with lots of accelerating in the lower gears and lots of hard braking makes for far less fuel efficiency than a track that flows more. But the engineers need to know precise figures so that no more fuel – and therefore weight – need be put in the cars than is absolutely necessary. The car tends to get quicker as its fuel load drops, but again, the engineers need to know by exactly how much in order to determine whether the extra performance brought by a low fuel load buys enough time to make an extra pit stop.
Often, the performance of the tyres degrades as the performance of the car improves because of its lower fuel load. At some crossover point, however, the car begins to lose more lap time from degrading tyres than it can find from lower weight. Practice gives the engineers and drivers a chance to establish where this point is. Again, this knowledge has a significant impact on the race strategy the team chooses.
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