1
Abstract
Long-haul trucks idling overnight consume more than 838 million gallons
(20 million barrels) of fuel annually. Idling also emits pollutants. Truck drivers
idle their engines primarily to (1) heat or cool the cab and/or sleeper, (2) keep
the fuel warm in winter, and (3) keep the engine warm in the winter so that the
engine is easier to start. Alternatives to overnight idling could save much of this
fuel, reduce emissions, and cut operating costs. Several fuel-efficient alternatives
to idling are available to provide heating and cooling: (1) direct-fired heater for
cab/sleeper heating, with or without storage cooling; (2) auxiliary power units;
and (3) truck stop electrification. Many of these technologies have drawbacks
that limit market acceptance. Options that supply electricity are economically
viable for trucks that are idled for 1,0003,000 or more hours a year, while
heater units could be used across the board. Payback times for fleets, which
would receive quantity discounts on the prices, would be somewhat shorter.
(20 million barrels) of fuel annually. Idling also emits pollutants. Truck drivers
idle their engines primarily to (1) heat or cool the cab and/or sleeper, (2) keep
the fuel warm in winter, and (3) keep the engine warm in the winter so that the
engine is easier to start. Alternatives to overnight idling could save much of this
fuel, reduce emissions, and cut operating costs. Several fuel-efficient alternatives
to idling are available to provide heating and cooling: (1) direct-fired heater for
cab/sleeper heating, with or without storage cooling; (2) auxiliary power units;
and (3) truck stop electrification. Many of these technologies have drawbacks
that limit market acceptance. Options that supply electricity are economically
viable for trucks that are idled for 1,0003,000 or more hours a year, while
heater units could be used across the board. Payback times for fleets, which
would receive quantity discounts on the prices, would be somewhat shorter.