Fuel Economy Calculator
Calculate fuel economy: L/100km, km/L, MPG (US). Distance and fuel used inputs.
How to Use
Enter your values in the fields above and click Calculate to get instant results. All computations run locally in your browser. No data is ever uploaded or stored.
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Fuel Economy Calculation
CalcSolver's fuel economy calculator computes efficiency in both km/L and L/100km from distance traveled and fuel consumed. The L/100km standard (used in most countries) measures consumption per distance, while km/L (used in Japan and some others) measures distance per fuel unit.
Driving 500km using 40 liters = 12.5 km/L or 8.0 L/100km. To convert between systems: L/100km = 100 / km/L. So 12.5 km/L = 8.0 L/100km. US MPG conversion: km/L = MPG × 0.4251 — 30 MPG ≈ 12.75 km/L.
Improve fuel economy with: maintaining proper tire pressure (3% improvement), removing excess weight, driving at steady speeds (60-80 km/h optimal for most cars), and avoiding aggressive acceleration. Regular maintenance (air filters, oil changes) can improve efficiency by 4-10%. Use CalcSolver's unit converter for distance/volume unit conversions.
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Frequently Asked Questions
How do I calculate fuel economy?
Divide the distance traveled by the fuel used. For MPG: miles ÷ gallons. For L/100km: (liters ÷ kilometers) × 100. Lower L/100km means better economy; higher MPG means better economy.
What is the difference between MPG and L/100km?
MPG (miles per gallon) measures distance per unit of fuel — higher is better. L/100km (liters per 100 kilometers) measures fuel per unit of distance — lower is better. They are inversely related.
How can I improve my fuel economy?
Drive at steady speeds, maintain proper tire pressure, reduce idling, remove excess weight, use cruise control on highways, and keep up with regular maintenance like air filter and spark plug replacement.