How to measure from a tank?

Fill the tank, drive a fixed distance, refill, then divide distance by litres refilled.

Depends on the vehicle. Compacts: 17–20; SUVs: 10–13 typically.

Tyre pressure affects?

Yes — low pressure can reduce efficiency 3–5%.

We use US mpg (3.785 L/gal). Imperial is ~20% larger.

Yes — set trips per month for a monthly estimate.

Compute your vehicle's fuel efficiency (km/L or mpg) and trip cost.

Practical calculatorFully localized assumptionsCountry-specificInteractive chart

Last updated: 2026-05-31

Source: default

Efficiency = Distance / Fuel · Trip cost = Fuel × Price

How to measure from a tank?: Fill the tank, drive a fixed distance, refill, then divide distance by litres refilled.
Is 15 km/L good?: Depends on the vehicle. Compacts: 17–20; SUVs: 10–13 typically.
Tyre pressure affects?: Yes — low pressure can reduce efficiency 3–5%.
US vs Imperial mpg?: We use US mpg (3.785 L/gal). Imperial is ~20% larger.
Commute mode?: Yes — set trips per month for a monthly estimate.

Results are estimates and not professional advice. Verify important decisions with a qualified professional.