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Updated July 2026How to calculate truck fuel cost
Truck fuel cost is calculated from three variables: distance, fuel consumption rate, and fuel price. The formula is:
Fuel cost = (Distance km × L/100km ÷ 100) × Price per litre
For example: a 800 km run in a semi-truck consuming 40 L/100km at $1.72/L diesel:
- Litres needed: 800 × 40 ÷ 100 = 320 litres
- Fuel cost: 320 × $1.72 = $550.40
- Cost per km: $550.40 ÷ 800 = $0.688/km
Cost per km is the most useful metric for pricing loads and calculating whether a run is profitable. Most Canadian owner-operators target total operating costs (fuel + wages + insurance + maintenance) of $1.80–$2.50/km and price loads accordingly.
Fuel consumption benchmarks by truck class
Fuel consumption varies significantly by vehicle type, load, speed, and terrain. These figures represent typical loaded highway averages used for planning purposes:
| Vehicle type | L/100km (loaded) | L/100km (empty) | Cost/km at $1.75/L |
|---|---|---|---|
| Semi-truck / 18-wheeler (Class 8) | 38–45 | 28–33 | $0.67–$0.79 |
| Flatbed (loaded) | 40–45 | 30–35 | $0.70–$0.79 |
| Tanker truck | 36–42 | 28–32 | $0.63–$0.74 |
| Straight truck (Class 6–7) | 18–26 | 14–20 | $0.32–$0.46 |
| Pickup truck / 1-ton diesel | 12–16 | 10–13 | $0.21–$0.28 |
| Cargo van (diesel) | 10–14 | 9–12 | $0.18–$0.25 |
Modern aerodynamic semi-trucks with low-rolling-resistance tires, idle reduction systems, and active fuel management can achieve 35–37 L/100km loaded — a 10–15% improvement over older equipment. At $1.75/L and 200,000 km/year, that improvement is worth $17,500–$26,000 annually in fuel savings.
Diesel prices in Canada
Diesel prices in Canada vary substantially by province due to differences in provincial fuel taxes, proximity to refineries, and local market conditions. British Columbia consistently has the highest diesel prices in Canada, driven by the BC carbon tax, provincial motor fuel tax, and Metro Vancouver's TransLink levy. Alberta typically has the lowest prices due to lower provincial taxation.
| Province | Relative price level | Key driver |
|---|---|---|
| British Columbia | Highest | BC carbon tax + TransLink levy (Metro Van) |
| Ontario | Mid-high | Federal excise + provincial fuel tax |
| Quebec | Mid-high | Quebec carbon market + provincial tax |
| Manitoba | Mid | No carbon consumer levy (opted out) |
| Saskatchewan | Mid | Agriculture exemption reduces effective rate |
| Alberta | Lowest | Historically lowest provincial fuel taxation |
| Atlantic provinces | Mid-high | Distribution costs from refineries |
For current diesel prices by province and city, use GasBuddy.ca (diesel filter) or the Natural Resources Canada fuel price monitoring tool. Price differences of $0.15–$0.25/L between provinces can significantly impact route planning for high-volume operators.
DEF (Diesel Exhaust Fluid) costs
All diesel trucks built after January 2010 are equipped with Selective Catalytic Reduction (SCR) systems that require Diesel Exhaust Fluid (DEF) to reduce nitrogen oxide (NOx) emissions. DEF is a non-toxic mixture of 32.5% urea and deionized water.
DEF consumption is approximately 2–4% of diesel fuel used — the standard planning figure is 3.5%. At $0.85–$1.00/L for DEF (available at most truck stops and bulk suppliers), this adds approximately $0.03–0.04/km for a semi-truck. While this seems small, at 200,000 km/year it amounts to $6,000–$8,000 annually — enough to be worth tracking in your operating cost calculations.
Running out of DEF will eventually de-rate the engine to a maximum speed of 8 km/h (5 mph) until DEF is added — a costly breakdown on any schedule. Bulk DEF purchases (1,000L totes) can reduce cost by 15–25% compared to jugs at truck stops.
Fuel surcharges explained
A fuel surcharge (FSC) is an additional charge on top of the base linehaul rate that compensates carriers for fuel price volatility. It is expressed as a percentage of the base rate and changes weekly based on the current average diesel price.
Most Canadian carrier agreements reference a fuel surcharge table tied to a benchmark diesel price — either the weekly Natural Resources Canada national average or a regional average. The table structure typically looks like:
| Diesel price range ($/L) | Fuel surcharge (%) |
|---|---|
| $1.40 – $1.49 | 22% |
| $1.50 – $1.59 | 25% |
| $1.60 – $1.69 | 28% |
| $1.70 – $1.79 | 31% |
| $1.80 – $1.89 | 34% |
| $1.90 – $1.99 | 37% |
| $2.00+ | 40%+ |
Note: Fuel surcharge tables vary by carrier and contract — the table above is illustrative. Always verify the specific table referenced in your carrier agreement or broker contract.
How to reduce fuel costs
Fuel is typically the single largest variable cost for Canadian carriers, representing 30–40% of total operating costs. The highest-return strategies for reducing fuel spend:
- Speed management: Fuel consumption increases sharply above 100 km/h. Reducing highway speed from 110 km/h to 100 km/h typically improves fuel economy by 8–12% on flat terrain — worth $5,000–$8,000 annually for a high-mileage semi.
- Idle reduction: Engine idle burns 3.5–4.5 L/hour. An APU (Auxiliary Power Unit) or diesel parking heater costs $5,000–$8,000 installed but pays for itself in 12–18 months for drivers doing multiple overnight runs.
- Aerodynamics: Side skirts, roof fairings, and trailer tails reduce drag. A full aerodynamic package on a semi-trailer can improve fuel economy by 5–8% at highway speeds.
- Tire management: Low-rolling-resistance tires and proper inflation (check cold every morning) can reduce fuel consumption by 2–4%. Under-inflated tires increase rolling resistance and wear — a double penalty.
- Fuel card programs: Major carriers like Petro-Canada, Shell, and Husky offer fleet fuel cards with volume discounts of $0.02–$0.08/L and detailed transaction reporting. At 400L per fill-up, even $0.04/L saves $16 per stop.
- Route optimization: Avoiding stop-and-go traffic, reducing out-of-route miles, and fuel-stop planning (buying cheap in Alberta vs. expensive in BC) all contribute meaningfully at scale.