Two fleets run the same class of electric box truck out of the same depot, on the same delivery map. One finishes the shift with charge in reserve and puts the truck on the plug at seven. The other is on the phone at two in the afternoon, asking a customer to hold a pallet while the driver hunts a public charger.

The difference is rarely the truck. In fleet work, range is set by the duty cycle: how hard the heater runs, how fast the route moves, how much weight is on board, how much grade sits between stops, and whether the truck ever stands still long enough to take a charge. A schedule built on that figure has no margin, which means route and load planning buys more usable range than a bigger battery does.

What Fleet Range Actually Means

Range comes down to usable pack energy divided by energy per mile. The numerator is fixed for a given truck on a given day. The denominator moves all shift. Every accessory you switch on, every extra mile per hour, every pound of cargo and every foot of climb adds to the energy it takes to move the truck one mile, and the pack does not grow to match.

That label number is a comparison figure, not a route result. It is measured under conditions a delivery route rarely reproduces, which makes it a fair way to compare one model against another and a poor way to build a schedule, because the work your truck does is not the work the measurement did.

So the number you can plan against is per route, per season, per load. The same truck on the same loop needs more energy in February than in April, and more when the cargo is dense than when it is bulky. Nothing has degraded. The duty cycle changed, which means the figure on the route sheet has to change with it.

Heating, Cooling, and Auxiliary Loads Take Range

Heating and cooling are the first line item to check, and the reason is that the traction pack feeds everything. Guidance for medium- and heavy-duty electric fleets names heating and cooling loads and their draw on the battery as range reducers, and points to auxiliary power units or heating and cooling equipment run on diesel or another fuel as an alternative to doing all of it electrically.

Tool power is the second. On medium- and heavy-duty units, auxiliary loads for cranes, lifts and off-board tools come out of the same pack. Cab climate and equipment power bite harder on a work truck than on a passenger car because the load is bigger relative to the miles driven: a crew cab with the doors open at every stop, a lift gate cycling all shift, a boom running between drops. Energy per mile climbs even when road speed never changes.

That is why two identical trucks on identical routes can post very different consumption. One keeps the cab closed and the climate load contained; the other leaves the cargo door open most of the day. If your climate or tool load is heavy, a fuel-fired heater or auxiliary power unit is worth pricing, because it moves part of that burden off the pack instead of asking the battery to do work it was never sized for.

Speed, Grade, and Payload Set Energy per Mile

Drag punishes the last few mph. Because drag rises with the square of speed, a truck pushing highway speed instead of a moderate cruise on the same stretch spends a disproportionate share of its pack pushing air, and that cost stacks on top of every other load rather than replacing one. High driving speeds sit on the list of factors that cut range on medium- and heavy-duty electric vehicles for exactly this reason.

Grade works differently. Climbing stores energy as height, and coming back down recovers only part of it, because regenerative braking and drivetrain losses take a cut at both ends of the exchange. A hilly loop therefore costs more than its flat equivalent even when it starts and ends at the same elevation. Payload adds mass that has to be accelerated out of every stop and lifted up every rise, so a truck that is heavy most of the day pays that bill hundreds of times.

The habit that follows is to carry a buffer. Guidance is to leave extra room in the vehicle's maximum range when the driving includes hilly terrain, heavy hauling or a lot of heating and air conditioning, rather than planning to the last mile. For a fleet, that buffer is a planning input: it belongs on the route sheet before dispatch, not in the driver's judgment at three in the afternoon.

Route Shape and Dwell Time Decide Usable Range

Route, charging opportunities, dwell times and the availability of public charging, along with what that charging costs, are the fleet-side variables. They matter as much as the truck. Where the vehicle goes, when it can plug in, how long it sits, and whether there is a charger near the stop all change the range you can schedule.

Suppose a route with an hour of loading dock time mid-day and a charger at that dock. That hour is not dead time for the pack; it is a partial refill, and the daily loop can be longer than the pack alone would allow. Suppose the same mileage with no dwell and no charger access. Same truck, same miles, and now the loop is genuinely tight. That is a hypothetical comparison, not a test result, but the arithmetic holds either way: usable daily range is a function of schedule, not only of pack size.

Dwell is also where the cost question lands. Public charging during a route carries its own cost, so a route that depends on it carries a scheduling risk and a price risk at the same time. A route that closes on its own overnight window carries neither.

BEV or PHEV for a Given Daily Run

The choice between an all-electric vehicle and a plug-in hybrid gets framed as a range question. It is closer to a scheduling question. For vehicles running roughly 100 to 300 miles a day that can plug in overnight, a battery electric vehicle may be suitable; if charging is available during the vehicle's idle periods, a BEV could exceed that daily band; otherwise a PHEV, with a much shorter all-electric range but another fuel for extended driving, may fit better.

Read that as a test of whether the daily duty cycle closes inside the charging window. Imagine a truck that comes home at six and leaves at six. It has a long window and a short daily need, which means a BEV works and the hybrid's engine is weight you carry all year for nothing. A truck running two shifts with no dwell has no window at all, and there the second fuel source is answering a scheduling gap rather than a battery gap.

Keep the scope honest. That daily mileage band comes from light-duty-oriented guidance, and light-duty examples are not guaranteed truck, bus or vocational specifications. For a specific chassis, the charging window, the route and the usable pack energy have to come from that model's own documentation.

What an Optimistic Range Number Costs You

A range plan built on the wrong number does not fail loudly. It shows up as a mid-shift charging stop, a missed delivery window, a truck back at the yard at low state of charge, and charging pushed into expensive hours because the overnight window was not enough. The pack sees deeper discharges and more cycles than the plan assumed.

For a maintenance reader, the visible cost is unplanned charging and the wear that comes with it. The invisible one is a schedule nobody believes, which is harder to repair and usually outlasts the vehicle.

What to do instead is unglamorous. Read each route as a duty cycle: climate load, tool load, speed profile, grade, payload, and the windows where the truck can take energy. Keep a reserve rather than planning to the maximum, especially on hilly or heavy work. Ask the manufacturer for that model's own range and charging documentation, and treat the published figure as an input to the plan rather than the plan itself.

The tradeoff is real. Planning around the actual duty cycle buys predictable range and fewer mid-shift surprises, and it costs you flexibility: fewer route changes on the fly, buffer miles you carry and never drive, and sometimes a smaller vehicle than the one you wanted. A larger battery buys slack too, paid for in capital, payload and charge time. Decide which of those you would rather pay for before the trucks arrive.