Start with the unit
What L/100 km tells you
In Canada, fuel consumption is normally shown in litres per 100 kilometres. A vehicle rated at 8.0 L/100 km is expected to use about eight litres to travel 100 kilometres under the conditions represented by that rating. A lower number means less fuel is used for the same distance.
Natural Resources Canada publishes separate city, highway, and combined ratings. The combined figure is useful for broad comparisons, but it is not a promise about your exact fuel use. Temperature, trip length, speed, traffic, idling, tires, payload, towing, elevation, and driving style can all change the result.
Transparent calculations
Four formulas that cover most fuel-cost questions
Keep kilometres, litres per 100 kilometres, and dollars per litre in their Canadian units. These formulas then work for a single trip, a monthly budget, or a full year.
Estimates the volume of fuel used for the distance.
Converts estimated fuel volume into Canadian dollars.
Makes different vehicles or fuel prices easier to compare.
Builds a yearly fuel-only budget from expected driving.
The fuel cost calculator applies the trip formulas and can double a one-way distance for a round trip or divide the selected cost among passengers.
Input quality matters
Choose inputs that match the decision
A better fuel-cost estimate uses
- Route distance: actual road kilometres, not straight-line distance.
- Fuel consumption: a recent real-world average when available.
- Fuel grade: the grade required or normally used by the vehicle.
- Local price: a current price from the area where fuel will be purchased.
- Trip conditions: city, highway, winter, towing, or heavy-load expectations.
- Separate legs: different routes or conditions calculated independently.
Statistics Canada publishes average retail gasoline prices by geography, but an average is not the price at a particular station. For a near-term trip, a current local station price is usually more relevant. For a long-range budget, test more than one price instead of treating today's amount as permanent.
Use the right benchmark
Official ratings and real-world consumption answer different questions
EnerGuide rating
Useful for comparing vehicles tested under a consistent method. Use city, highway, or combined depending on the comparison you are making.
Recent measured average
Better for budgeting your own driving when it covers representative fill-ups, seasons, routes, and vehicle use.
Conservative estimate
Useful when conditions may be worse than normal. Test a higher L/100 km or fuel price to see how much room the budget needs.
| Input | Best source | Best used for | Watch for |
|---|---|---|---|
| EnerGuide rating | Natural Resources Canada | Comparing vehicles consistently | City, highway, and combined differ |
| Measured average | Representative fill-ups | Personal trip and annual budgets | Seasonal or route changes |
| Conservative scenario | A tested higher input | Budget headroom | Do not present it as a prediction |
Do not compare an official highway rating with a winter city average and conclude that one source is wrong. The conditions are different. For purchase research, official ratings provide a common benchmark; for a personal budget, your representative measured average can be more useful.
Annual fuel budget
A Canadian driver travelling 15,000 km per year
Suppose a vehicle averages 8.4 L/100 km and regular gasoline is budgeted at $1.65 per litre. The estimate uses 1,260 litres for the year and costs $2,079.
- Annual distance
- 15,000 km
- Fuel used
- 1,260 L
- Cost per 100 km
- $13.86
- Annual fuel cost
- $2,079
If consumption rises to 9.5 L/100 km while distance and price stay the same, the annual estimate becomes $2,351.25—about $272 more. That sensitivity is often more useful than presenting one total as certain.
Fuel is only one part of vehicle cost. Financing, insurance, maintenance, tires, parking, tolls, depreciation, and repairs are outside this calculation.Before a road trip
A practical trip-planning checklist
- Check the actual route distance and any planned detours.
- Choose a consumption figure that fits the route and season.
- Use the correct fuel grade and a current price per litre.
- Calculate outbound and return legs separately when conditions differ.
- Add ferries, tolls, parking, charging, and accommodation outside fuel.
- Recalculate if the route, vehicle, fuel price, or passenger split changes.
A passenger split is a budgeting agreement, not a complete measure of vehicle wear or ownership cost.
Common questions
Frequently asked questions
Is a lower L/100 km number better?
Yes. It means less fuel is used over the same 100-kilometre distance. Compare vehicles under similar test conditions and consider the type of driving you actually do.
Why is my real fuel use higher than the published rating?
Published ratings use standardized testing. Cold weather, short trips, congestion, idling, speed, tires, load, roof racks, towing, terrain, and driving style can raise real use.
Should I use city, highway, or combined consumption?
Use the figure that best matches the trip. For mixed annual driving, combined is a useful starting point; a representative measured average is often better for a personal budget.
Does the calculator include premium fuel automatically?
No. Enter the price of the grade you plan to buy. Confirm the manufacturer's fuel requirement before assuming regular gasoline is appropriate.
Does this method cover electric or plug-in hybrid driving?
It covers liquid fuel. Electricity use, charging losses, rates, and electric-mode distance must be calculated separately for a battery-electric or plug-in hybrid scenario.
Check the underlying data
Official Canadian references
Use these sources for standardized ratings and broader price context, then use current local figures for your own estimate.