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Open Calculator โOverview
Manufacturer fuel economy figures are measured under ideal test conditions. Real-world efficiency is 10-20% lower. Understanding how to calculate and improve yours saves real money.
The Formula
km/L = Distance รท Litres used | Cost per km = Price per litre รท km/L
Standard formula used by professionals worldwide
Worked Example
Step-by-step
400km, 35L used โ 11.4 km/L | Fuel at 1.80/L โ cost per km = 0.158/km
Key Concepts
- Accuracy: Results are as accurate as the inputs you provide
- Units: Always use consistent units throughout your calculation
- Verification: Double-check important calculations before making decisions
- Professional advice: For major financial, health, or structural decisions, consult a qualified professional
Privacy and Security
- All calculations run entirely in your browser
- No data is sent to any server
- No sign-up or personal information required
- Your data stays private โ always
Frequently Asked Questions
Most efficient speed?
80-90 km/h typically. Efficiency drops significantly above 110 km/h due to air drag.
AC effect on efficiency?
Reduces efficiency 5-25% depending on conditions. More at low speeds, less on motorways.
Weight effect?
Each extra 50kg reduces efficiency by approximately 1-2%.