The stated question is very general. It depends....? Are you looking for a root for the decision tree, or a way to navigate it?
In the most general terms, I'd say 1/3 aero, 1/3 powertrain and 1/3 driver training.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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