Why do long haul truckers warm up their engine for 30 minutes before leaving?
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I used to be a long haul trucker. There is no need to let a truck idle for 30 minutes before starting. A few minutes is plenty sufficient.
So many of these answers are just people guessing.
No, an idling truck is NOT surprisingly fuel efficient. An idling truck burns about a gallon an hour. This is why many trucks are equipped with diesel heaters that can keep the cab warm without idling.
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