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MPG Calculator

⛽Fuel Efficiency Converter

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We're working on a comprehensive educational guide for the MPG Calculator in your language. The content below is shown in English.

What is MPG Calculator?

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Miles per gallon (MPG) is the standard measure of fuel economy in the UK and US — how many miles a vehicle travels on one gallon of fuel. The higher the MPG, the more fuel-efficient the car. Litres per 100km (L/100km) is used in continental Europe.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to MPG Calculator

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1Fill the tank completely and note the odometer reading
2Drive normally until you need to refuel
3Fill the tank again and note: litres added and new odometer reading
4MPG = Miles driven / Gallons used (1 gallon = 4.546 litres in UK, 3.785 litres in US)

Worked Examples

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Example 1

Given:350 miles driven · 45 litres added (UK)

Rezultatas:35.3 MPG

45 L ÷ 4.546 = 9.9 gallons; 350 ÷ 9.9 = 35.3

Example 2

Given:500 km · 40 litres

Rezultatas:8 L/100km

40÷500×100 = 8

Typical MPG by vehicle type

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Vehicle type	Typical MPG (UK)	L/100km
Small city car (e.g. Fiesta)	45–55 MPG	5.1–6.3 L
Family saloon (e.g. Golf)	35–50 MPG	5.6–8.1 L
SUV / Crossover	25–40 MPG	7.1–11.3 L
Large 4x4	20–30 MPG	9.4–14.1 L
Hybrid (e.g. Prius)	55–70 MPG	4.0–5.1 L

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Did you know?

Official WLTP fuel economy figures are measured on a standardised test cycle and typically overstate real-world MPG by 10–25% due to air conditioning, traffic, and driving style.

References

›Fuel economy in automobiles — Wikipedia

For informational purposes only. This tool does not constitute financial advice. Consult a qualified financial adviser before making investment or financial decisions.

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MPG vs Fuel Cost

Formula-verified for precision

Reviewed October 2026

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