MPG Fuel Efficiency Calculator
Calculate MPG, L/100km, and fuel costs for your vehicle
Unit Type
US MPG Imperial MPG L/100km
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Fuel Efficiency Formulas
US MPG = miles / gallons
L/100km = 235.215 / US MPG
Imperial MPG = US MPG × 1.20095
Cost per mile = fuel price / MPG
Understanding your vehicle's fuel efficiency helps save money and reduce environmental impact.
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Remember: Higher MPG means better fuel efficiency, while lower L/100km means better efficiency.
What Is Fuel Efficiency?
Fuel efficiency measures how far a vehicle can travel per unit of fuel. Higher efficiency means lower fuel costs and reduced carbon emissions.
MPG Explained
Miles per gallon: distance traveled per gallon of fuel. Higher = better efficiency.
L/100km Explained
Liters per 100km: fuel used per 100 kilometers. Lower = better efficiency.
Cost Savings
Improving from 20 to 30 MPG saves ~$583/year at $3.50/gallon driving 10,000 miles.
Environmental Impact
Each gallon of gasoline burned emits ~8.8 kg (19.4 lbs) of CO₂.
Example: 300 miles, 10 gallons. US MPG = 300/10 = 30 MPG. L/100km = 235.215/30 = 7.84 L/100km. At $3.50/gallon, cost per mile = $0.117.
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Frequently Asked Questions
What is good MPG?▼
Good MPG depends on vehicle type. Compact cars: 30+ MPG city, 40+ MPG highway. SUVs: 20+ MPG city, 25+ MPG highway. Electric equivalents: 100+ MPGe.
US vs Imperial MPG?▼
US gallon = 3.785 liters. Imperial gallon = 4.546 liters. 30 US MPG = 36 Imperial MPG = 7.84 L/100km.
How to improve MPG?▼
Maintain steady speed, avoid rapid acceleration, keep tires properly inflated, reduce vehicle weight, and follow recommended maintenance.
MPG vs L/100km?▼
MPG = higher is better. L/100km = lower is better. Formula: L/100km = 235.215 / MPG (US). MPG = 235.215 / L/100km.
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