Understand how much fuel a reefer unit burns per hour, the real cost of running a refrigerated trailer, and practical strategies to reduce reefer fuel expenses. Covers diesel vs electric standby and cost-per-mile calculations.
return ( How Much Fuel Does a Reefer Unit Burn? A standard trailer-mounted reefer unit (Carrier or Thermo King) runs on its own diesel fuel supply, separate from the truck engine.
The fuel consumption rate depends on the operating mode, ambient temperature, set point temperature, and the condition of the unit.
Here are the general ranges: Continuous run (pulling down or maintaining frozen temps): 1.0 to 1.5 gallons per hour.
This is the highest consumption mode, used during pre-cool and when hauling frozen freight at 0F or below.
Continuous run (maintaining fresh temps, 34-40F): 0.7 to 1.2 gallons per hour.
Less demanding than frozen because the temperature differential between inside and outside is smaller.
Cycle-sentry / start-stop mode: 0.3 to 0.8 gallons per hour on average.
The unit runs intermittently, starting when the temperature rises above the set point and stopping when it reaches the target.
This is the most fuel-efficient mode for maintaining temperature on well-insulated trailers.
Over a full day (24 hours), a reefer unit hauling frozen freight on continuous run can burn 24 to 36 gallons of diesel.
On a multi-day cross-country run, reefer fuel alone can cost $200 to $400 or more.
This is a real operating expense that must be factored into your rate calculations.
Calculating Your True Reefer Fuel Cost To understand your reefer operating costs, track these numbers for each load: Reefer fuel purchased: Keep reefer fuel receipts separate from truck fuel.
Most reefer tanks hold 50-100 gallons.
Hours of operation: Note when you start and stop the reefer.
Most units have an hour meter on the display.
Miles driven on the load: From pickup to delivery.
Calculate cost per mile: Divide total reefer fuel cost by miles driven.
For a typical Southeast run, this adds $0.15 to $0.35 per mile to your operating cost.
At $4.00/gallon diesel and 1.0 GPH consumption over a 500-mile run taking 10 hours of drive time plus 8 hours of overnight idle, the reefer fuel cost is roughly $72 — or $0.14 per mile.
For frozen freight at 1.3 GPH over a longer 800-mile run taking 30 total hours, the cost rises to $156 — or $0.20 per mile.
Always factor reefer fuel into your rate negotiations.
A reefer load should pay more than an equivalent dry van load, and the difference should cover your reefer fuel plus a margin.
If a reefer rate is only $0.10-$0.15/mile above dry van rates on the same lane, you may actually lose money after reefer fuel.
Diesel vs Electric Standby Some shipping and receiving facilities offer electric standby connections at their docks.
This allows you to plug the reefer unit into shore power (typically 460V three-phase) and run the refrigeration compressor electrically instead of burning diesel.
The benefits are significant: Zero diesel consumption while plugged in.
If you are sitting at a dock for 4-8 hours waiting to load or unload, electric standby saves 4-12 gallons of fuel.
Reduced engine wear on the reefer unit.
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