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Do you have more details about the situation?
For example was the engine warm?
It could be running just to get warm, but that's really just the first dozen minutes of using the car on a day.
Do you have the shifter in "B" mode? that's the only situation i can think of to keep the engine on. that or if you're trying to heat the cabin. been a while though.
Sure, but why not interact with the people you asked for help. Would you stop for directions and then drive off without saying thank you or even better buy a pack of gum? You didn't stop to chat after all. Just sayin'.