What Is Fuel Economy (MPG)?
Fuel economy measures how far a vehicle travels on a given amount of fuel. In the United States it is expressed in miles per gallon (MPG); in many other countries as liters per 100 kilometers (L/100 km), where a lower number means better efficiency. Fuel cost per mile = fuel price ÷ MPG.
Converting
L/100 km ≈ 235.2 ÷ MPG (US gallons). 30 MPG is about 7.8 L/100 km.
Trip Cost
Trip fuel cost = distance ÷ MPG × price per gallon.
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Mileage & Gas Cost Calculator
Find the true fuel cost of any trip — great for commuters and gig drivers.
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Unit Converter
Convert length, weight, and temperature between metric and imperial units.
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IRS Mileage Reimbursement Calculator
Find your reimbursement or deduction using the current official IRS rate.
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Last updated: September 27, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.