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Fuel Consumption Calculator
This fuel consumption calculator tells you how many litres your car uses per 100 km, the total cost of a trip, and the cost per kilometre. Just enter the distance, the fuel used (or your known consumption rate), and the current fuel price per litre.
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How we calculate fuel consumption
Consumption (l/100 km) = litres ÷ km × 100. Trip cost = litres × price/l. Cost per km = trip cost ÷ km. If you know the consumption rate instead of litres used: litres = consumption/100 × km.
Example fuel consumption calculation
Route: 300 km, 27 litres used, fuel price PLN 7.50/l. Consumption: 27 ÷ 300 × 100 = 9 l/100 km. Trip cost: 27 × PLN 7.50 = PLN 202.50. Cost per km: PLN 202.50 ÷ 300 = PLN 0.68/km.
Frequently asked questions about fuel consumption
What is considered average fuel consumption for a car?
Average fuel consumption for a typical passenger car is 6–9 l/100 km for petrol and 5–7 l/100 km for diesel in mixed driving. Hybrid cars average 4–6 l/100 km and modern EVs consume 15–20 kWh/100 km.
How do I measure my actual fuel consumption?
Fill the tank full, reset the trip counter, drive normally until you need to refuel, then fill up again and note the litres added and the distance driven. Use these figures in the calculator.
What factors affect fuel consumption the most?
Driving speed (consumption rises sharply above 120 km/h), acceleration style, tyre pressure, air conditioning use, vehicle load, and road gradient all significantly affect consumption.
What is the current average fuel price in Poland?
Fuel prices change daily. As of mid-2025, petrol (Pb95) is approximately PLN 6.00–6.80/l and diesel (ON) approximately PLN 5.80–6.50/l at Polish stations.
How do I reduce fuel costs on long trips?
Maintain a steady speed (cruise control), keep tyres properly inflated, avoid unnecessary loads, plan routes to avoid congestion, and consider refuelling at cheaper stations along the route.
How do I convert l/100 km to mpg?
To convert l/100 km to UK mpg: divide 282.48 by l/100 km. To convert to US mpg: divide 235.21 by l/100 km. Example: 8 l/100 km = 35.3 UK mpg.
What is the difference between city and highway consumption?
City driving typically consumes 20–40% more fuel than highway driving due to frequent acceleration, braking, and idling. Diesel and hybrid vehicles show a smaller gap.
How much does air conditioning increase fuel consumption?
A/C can increase fuel consumption by 10–20% in city driving and 5–10% on the highway. At lower speeds, opening windows may be more economical.
Is LPG cheaper than petrol in Poland?
LPG (autogaz) costs roughly half the price of petrol per litre, but LPG consumption is about 15–20% higher. Overall savings are typically 30–40% compared to petrol.
How do electric vehicle running costs compare to petrol?
Charging an EV at home (PLN 0.75/kWh) for 100 km at 18 kWh/100 km costs ~PLN 13.50, versus PLN 45–55 for a petrol car at 7 l/100 km — roughly 3–4 times cheaper.
Results are estimates based on inputs provided. Actual fuel consumption varies with driving style, road conditions, and vehicle load. Use current pump prices for accuracy.
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