Tesla Motors Club

While the new cars have smaller engines, other changes to the formula (like larger batteries) mean that the cars are heavier overall. Yet the minimum weight limit has apparently not been adjusted proportionately, forcing teams to look even harder to trim excess weight. And when everything's already made of carbon fiber, there's not much more weight to cut, so the onus falls on the drivers.

F1 drivers dangerously losing weight to improve performance - Autoblog

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