The average miles per gallon of a semi-truck is bad enough when barreling down the highway — somewhere in the range of 6-8 MPG — but things don’t look much better when the 18-wheeler’s at a standstill. Even when it’s not moving, an idling semi-truck continues to burn fuel at an alarming rate. It explains why idling the engine while stopped has become such an expensive habit in the trucking industry: Whether it’s to keep power going to the cabin appliances or to keep things feeling comfortable while loading up, idling is far from an innocent act. It racks up fuel costs, damages engines, and harms the environment to boot.
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