The "Turn Off Engines" sings have been at gas stations for decades because back in the day it was possible that a running engine could spark a fire that could travel back through the system. Nowadays it is almost impossible with newer vehicles. It's still highly advised that you don't because of freak occurances. The only exception is vehicles with diesel engines. Those can be running and NEVER cause a problem.
EDIT: It's your life though and if you think the extra 20 seconds you save are worth playing a death lotto with really, really, really bad odds of "winning", go for it.
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