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I read a report maybe ten - fifteen years ago about an experiment conducted by Mercedes-Benz on heavy-duty truck Diesel engines. They found that switching the engines off and back on again thirty times per minute - i.e., about as fast as it is possible to do - used less fuel than leaving the engines idling for the same minute.

This would seem to answer this question! But I cannot find the original source document. Can anyone else help?

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17y ago

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