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Semis that pull one trailer get six miles to the gallon on fairly level roads, so if the truck is out on the Interstate going 60mph it burns 10 gallons per hour. Add to that idling time, diesel for your refrigerated trailer, and so on...figure anywhere from 10 to 20 gallons per hour depending on where you're going and what you're doing. We also burn a little fuel going down hills because we use the engine to help slow the truck. Like my instructor said, put it in sixth with the Jake brake on, apply 10 pounds of brake pressure and you'll go down with no problem at all.

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16y ago

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