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Subject: highway mileage Помогите перевести предложение:Their efficiency increases, much like the average miles per gallon of a car increases when most of the driving is highway mileage rather than "stop-and-go" driving.In multiple boiler systems, the total output is divided up among two or more boilers, referred to as "stages." Only the boilers that are needed to closely match the heating load at any given time are fired. This allows boilers that are being fired to operate for longer periods. Their efficiency increases, much like the average miles per gallon of a car increases when most of the driving is highway mileage rather than "stop-and-go" driving. Заранее спасибо
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