Reefer Fuel Burn Calculator: Gallons and Cost

How reefer fuel consumption is estimated

A reefer unit's fuel use depends on four things: how cold it has to hold, how hot it is outside, how long it runs and whether it runs all the time or cycles. The calculator combines them like this:

Base burn = an example gallons-per-hour figure for the setpoint band: fresh, chilled, frozen or deep frozen
Outside temperature = base × 0.8 when cool, 1.0 when mild, 1.25 when hot
Mode = start-stop reduces the burn by the saving you set, 40% by default
Gallons = burn rate × run hours, and cost = gallons × diesel price
Hours per tank = tank size ÷ burn rate

The base rates are a rule of thumb, not a measurement, and units vary a lot by make, age and condition. If you know your unit's figure from its spec sheet or your fuel card history, enter it in the assumptions.

Source: FreightWaves, Guess less, save more: Smarter reefer management that pays off (June 27, 2025), citing EROAD data, October 2026

A worked example

A frozen load at 0°F runs 40 hours over the trip in mild weather, continuous mode, with diesel at $6.38 and a 50-gallon reefer tank.

Worked exampleEXAMPLE

Burn rate: 0.9 gal/hr
Gallons: 36
Fuel cost: $230
Hours per tank: 56

In start-stop mode the same run uses about 22 gallons, around $138. In a hot week the continuous figure climbs to 45 gallons. That's why unit fuel belongs in the rate on every reefer load, not left for the driver to absorb. Add a four-hour wait at a busy produce shed and the continuous run picks up another three to four gallons before the truck even moves.

How long can a reefer trailer run?

On a full tank, roughly as long as the hours-per-tank figure shows, which for many units is a couple of days of continuous running. The real limit is usually planning: a long wait at a shed, a 10-hour break and a slow receiver can drain a tank that looked full at pickup. Check the gauge before every long wait, and fuel the unit when you fuel the truck. Running a unit dry with product on board is one of the fastest ways to a rejected load, and the cargo claim that follows is usually the carrier's. A cheap habit, like topping up the reefer tank at every truck fuel stop, avoids it.

Continuous or start-stop

Continuous run mode for fresh produce, chilled meat and other temperature-sensitive cargo; start-stop mode should not be used for fresh produce. Start-stop saves fuel on frozen and less sensitive loads, but the mode is the shipper's call, written on the bill of lading. Running a produce load in start-stop to save fuel can lead to a rejected load that costs far more than the fuel saved.

Source: UF/IFAS HS1328, Protecting Perishable Foods During Transport by Truck or Rail (Brecht et al.), revision of USDA Agriculture Handbook 669, October 2026

Ways to cut reefer fuel

Precool the trailer at the setpoint before loading, not with product already inside.
Keep door openings short, especially on multi-stop 26 ft reefer box truck routes.
Keep the condenser clean and the unit serviced on schedule; a neglected unit burns more for the same job.
Use start-stop where the shipper allows it, usually on frozen loads.
Plan around long waits: ask for appointment times that don't leave the unit running for hours at a dock.

Reefer fuel and fuel tax

Fuel that runs only the reefer unit, from its own tank, is generally handled differently from the truck's motor fuel on an IFTA return. Keep it on a separate receipt from the truck's fuel, so it doesn't lower your reported MPG or add to your fuel tax. Confirm the exact rules with your base jurisdiction or the person who prepares your fuel tax return.

Getting unit fuel paid

A fuel surcharge is based on the truck's miles, so it never covers the unit. On a long wait or a multi-day run, ask how the rate covers unit fuel, and get detention terms written on the rate con. When we dispatch a reefer, we ask these questions before the load reaches you, and you see every term before you say yes. Our fee is 5% for one reefer with authority older than 6 months and 7% for 26 ft reefer box trucks. See reefer dispatch and our guide to reefer rates.

Questions about this calculator

Q01How long will a reefer unit run on a tank of fuel?

Divide the tank size by the unit's burn rate. A 50-gallon tank at about 0.9 gallons an hour lasts a little over two days of continuous running; in start-stop mode, or in cool weather, it lasts longer. Burn rate changes with setpoint, outside temperature, mode and how often the doors open, so treat any figure as an estimate and check the gauge.

Q02How much fuel does a reefer use per hour?

It depends on the unit, the setpoint, the weather and the mode. Frozen loads in hot weather burn the most; fresh loads in cool weather the least. The calculator starts from an example rule of thumb and lets you replace it with your own unit's figure from its spec sheet or your fuel records, which is always better.

Q03Is start-stop mode cheaper to run?

Usually, yes. Switching a reefer unit from continuous to start-stop mode can cut run time and fuel use by about 40%, according to industry data. But fresh produce, chilled meat and other temperature-sensitive loads generally ship in continuous mode, so use whatever mode the shipper puts on the bill of lading, not whichever is cheaper.

Q04Is reefer fuel included on an IFTA return?

Fuel used only to run the refrigeration unit, from a tank that doesn't feed the truck's engine, is generally treated differently from motor fuel for IFTA. Buy it on a separate receipt so it doesn't distort your MPG and fuel tax. Rules and records can vary, so confirm the details with your base jurisdiction or fuel tax preparer.

Q05Who pays for reefer fuel on a long wait?

Whatever the rate con says. Most spot rates are all-in, so unit fuel comes out of the rate unless the broker agrees to pay for it. On long waits at produce sheds, it's worth asking whether detention covers the unit fuel too. Our dispatchers ask before a reefer load reaches you.

Reefer fuel burn calculator: what the unit burns on this run