There’s no question that engine idling has a measurable impact on a fleet’s operating costs; by some accounts, every hour of idle time can decrease fuel efficiency by 1%. For some fleets, the answer is an auxiliary power unit (APU). In comparison, an APU that provides heat, cooling and electricity can use an estimated 0.1 to 0.3 gals. of fuel per hour compared to 1 gal. or more an hour for an idling truck engine.
“Fleets can evaluate whether they can benefit from an