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There is a trade off,
The truck is doing the work to push the air out of the way and creating a slipstream whether you're in it or not though, you're not slowing a truck down by tailgating it
Aerodynamics is not a subject which is intuitive. That is an approximate quote from Colin Chapman in his book about the Sports Car. He should know!
QuoteThere is a trade off,As for using energy from passing traffic. Low drag bodies are the best value for motor cars so they would produce relatively little power in the form of 'wind'. Anything which took substantial power from the disturbed air from passing cars would almost certainly couple itself to the cars and slow them down a bit. You can't get owt for nowt, lad.
Michele Benn asked the Naked Scientists:Is it possible to capture the wind that is produced from driving a automobile to power the vehicle. It has to be good for something.What do you think?