Guides
Portable restroom fleet operating cost per mile: US routes
Portable restroom fleet operating cost per mile: US fuel, labor, and route-density figures, with a brief note on Canadian sales taxes.
What to take away
- Fuel is the smallest per-mile line on a service truck. For this portable restroom fleet operating cost per mile breakdown, US diesel costs about 47 cents per mile at 8 mpg and $3.75 per gallon.
- Paid drive time usually costs more than fuel. Two technicians at $25 per hour burn about 83 cents per mile at 60 miles per hour.
- Route density moves cost per stop harder than fleet size does. Twelve units on one street beat twelve units across twelve towns.
- Disposal, maintenance and recordkeeping add fixed drag to every mile.
- Canadian routes use the same cost categories, with a 5% to 15% tax layer.
Reading a fuel number off the dashboard
Retail diesel sets the top line. US on-highway diesel has swung from under $4 to above $5 per gallon within the last few years, and Canadian pump prices follow crude plus provincial taxes. Consumption, not price alone, decides what a mile costs.
Illustrative inputs for a mixed service day:
Reading a fuel number
| Vehicle and load | Fuel economy | Diesel at $3.75 per gallon |
|---|---|---|
| Loaded vacuum pump truck | 6 mpg | 62.5 cents per mile |
| Service pickup with units | 14 mpg | 26.8 cents per mile |
| Empty return leg | 9 mpg | 41.7 cents per mile |
A route that runs 60 miles, 25 loaded and 35 empty, lands near 50 cents per mile in fuel. Diesel exhaust fluid adds roughly 2% to 3% of fuel volume on top.
Drive time, the larger cost line
Fuel is visible on a receipt. Labor hides in payroll. A technician at $25 per hour costs about 42 cents per minute. A two-person crew costs about 83 cents per minute of route time, before overtime.
Costing a route honestly
- Record odometer start and finish; split loaded from empty miles
- Record wheel-stop time at each stop, not just drive time
- Multiply total paid minutes by blended crew rate with payroll taxes
- Add fuel, DEF, tolls, prorated maintenance and tires
- Divide by units serviced or by stops
Steps for costing a route honestly:
- Record odometer start and finish, and split loaded miles from empty miles.
- Record wheel-stop time at each stop, not just drive time.
- Multiply total paid minutes by the blended crew rate, including payroll taxes.
- Add fuel, DEF, tolls and a prorated share of maintenance and tires.
- Divide by units serviced for a per-unit figure, or by stops for a per-stop figure.
Two crews on the same route can post different per-unit costs if one logs drive time and the other does not.
Route density and cost per stop
Shift the same 12 units from a 45 mile loop to a 6 mile loop and drive time collapses. At 30 mph average and 83 cents per minute, 45 miles costs 90 minutes. Six miles costs 12 minutes.
Loop length drives cost per stop
45 mile loop
- Drive time
- 90 minutes
- Average speed
- 30 mph
- Crew rate
- 83 cents/min
- Units shifted
- 12 units
6 mile loop
- Drive time
- 12 minutes
- Average speed
- 30 mph
- Crew rate
- 83 cents/min
- Units shifted
- 12 units
Density, not fleet size, decides whether a stop is a short hop or half a day.
Density also changes how many stops a truck can finish before a disposal run. Treatment plant hours and tipping fees cap the day, so a tight route with a nearby dump station finishes more units.
Example: a 40 unit Monday on one site
Assume 40 units at one address and a 60 mile round trip. Costs below are illustrative, built from the rates already shown.
Example: a 40 unit Monday
- $50minutesDrive, 60 minutes at 83 cents per minute
- $266minutesOn site, 8 per unit with two technicians, 320 minutes at 83 cents
- $30Fuel, 60 miles at 50 cents per mile
- $9Prorated maintenance and tires, 60 miles at 15 cents per mile
- $85Disposal and records at the plant gate
- $440Total
Split the same 40 units across ten small sites instead. Drive grows to roughly 180 miles, and each site adds setup and paperwork time. Per-unit cost can double without any change in the work itself.
The Canadian tax layer
Canadian fleets run the same trucks on the same math, then add sales tax. Rates run from 5% in Alberta to 15% in the Atlantic provinces and Ontario. Registered businesses claim input tax credits on units, trucks and servicing. The guide to GST/HST on portable restroom rentals breaks down what each province charges and what can be recovered.
Surge work and standby routes
Disaster work replaces density with urgency. A hurricane landfall or a wildfire evacuation order turns a scheduled loop into a 72 hour standby, and standby pricing looks nothing like a per-mile rate. The companion guide to disaster surge pricing explains how Houston hurricane and Mountain West wildfire fleets staff callouts and get paid faster with telematics.
Compliance costs per mile
Federal rules add cost lines that do not vary with route density. FMCSA inspection, repair, and maintenance rules set the recordkeeping floor for every truck and trailer in the fleet.
Toilet counts per worker are set by regulation, and they decide how many units a site orders. Construction sanitation requirements list the ratios that drive unit counts and, in turn, stop density.
Waste from pump-outs is regulated from the unit to the treatment plant. The EPA RCRA overview covers the disposal rules that set tipping and hauling costs.
