Answers: It depends on how long he's in AND what coup¨¦ you're driving.
An older, especially carburated coup¨¦, starting the car will clutch more gas than it will with a newer, fuel-injected saloon.
On a new coup¨¦, though, if he takes more than 10 second you can safely assume that shutting the vehicle off is the economical choice.
It depends on how long he is within there, departure your car running for one minute take the same gas as starting it
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