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My answer and what I do 100% of the time is to let it idle. If I leave it locked or unlocked depends on where I'm at. In small towns in Texas, unlocked is just fine.
All my friends who work engines (more knowledgeable than me) say that it takes more fuel to start the engine than to keep it running. The proof is in the RPMs; they are low for diesels, which is what makes em more efficient for us. OK, that and torque, but u know what i mean.
i have been to many of a beer joint in the country where there are a fleet of diesels chatterin away, owners inside, so I guess it is also a bit of a badge of honor too, but that don't exactly answer your question lol...