Fuel is variable rather than fixed, but it can take a large share of a monthly budget. Distance, real consumption and the current pump price give a better monthly fuel-cost estimate than a national average.
Fuel sits among the variable household expenses, alongside the fixed parts of your transport budget.
What does Fuel cover?
Include petrol, diesel, LPG or another fuel. Charging costs use the same principle with kilowatt-hours and charging prices. Parking, tax, insurance and maintenance belong under total transport costs, not fuel. Receipts and odometer readings are usually more reliable than the dashboard estimate.
Average monthly cost
Formula: monthly kilometres / kilometres per litre × current price per litre.
At 900 kilometres per month, 15 kilometres per litre and an example price of €1.90, you need 60 litres and spend €114 per month. Replace the example with the average price you actually pay. For litres per 100 kilometres, multiply monthly distance by that figure / 100 and then by the litre price.
How to save on Fuel
- Drive smoothly and anticipate braking and acceleration.
- Keep tyres at the recommended pressure.
- Remove unused weight and roof racks.
- Combine short trips and walk or cycle when practical.
- Compare stations on your route; a detour can erase a small discount.
- Track each fill-up to spot unusual consumption.
Fewer kilometres or a more efficient travel mode usually saves more than a few cents at the pump.
Comparing and switching
Compare the full journey cost by route and travel mode. When considering another car, include purchase price, depreciation, insurance and maintenance; fuel economy alone does not make replacement worthwhile.
Adjust your monthly amount when distance, vehicle or prices change, keeping your fixed and variable expense average useful.