Driving & travel · Calculator companion · By K Imports
Fuel journey cost: practical guide
This guide explains how to use the Count.ie fuel journey cost. Compare litres per 100 km and UK or US MPG costs. Follow the inputs, method and worked example below, then compare your own scenario.
Guide written .
Open the Fuel journey cost calculatorWhat to prepare
- Record the distance, vehicle specification and the relevant fuel or electricity price.
- Separate one-off purchase or import costs from recurring running costs.
- Use observed consumption where available and label any manufacturer's figure as an assumption.
Understand the inputs
- Consumption value
- Zero is valid for L/100km, but not for MPG (a denominator).
- Consumption unit
Options: Litres / 100 km; MPG — imperial UK gallon; MPG — US gallon.
The calculation method
Litres = distance × L/100km ÷ 100. MPG first converts using the selected gallon definition.
Worked example
Illustrative inputs and their result.
Example inputs
- Journey distance (km)
- 150
- Consumption value
- 6.5
- Consumption unit
- Litres / 100 km
- Pump price (€/litre)
- 1.8
Calculated example result
- Fuel cost for the journey
- €17.55
- Fuel used
- 9.75 L
- Cost per km
- €0.117/km
How to interpret the result
A running-cost or range estimate is not a guarantee of real-world performance. Weather, loading, driving conditions, charging losses and changing prices can alter the result.
Compare vehicles over the same distance and ownership period. Test a higher energy price or worse consumption before deciding that the apparent saving is dependable.
Common mistakes to avoid
- Do not mix litres per 100 km with miles per gallon, or battery capacity with energy purchased.
- Distinguish an advertised charging power from power sustained during a full session.
- Check taxes, vehicle classification and exclusions against the stated date and sources.
Assumptions and sources
Fuel only: tolls, parking, maintenance and vehicle depreciation are excluded.
If your case falls outside this scope, use a more suitable calculator or contact us about an unclear method.