Gas Mileage Calculator
Calculate your vehicle fuel efficiency (MPG or L/100km) and estimate trip fuel costs.
How to Calculate
MPG = Miles Driven ÷ Gallons Used; L/100km = 235.215 ÷ MPG
Fuel efficiency is calculated by dividing distance by fuel consumed. MPG (miles per gallon) is common in the US, while L/100km (liters per 100 km) is used in most other countries. Trip cost = Distance ÷ Efficiency × Fuel Price.
Frequently Asked Questions
How do I calculate MPG?
Fill your tank completely, reset your trip odometer, drive normally, then fill up again. MPG = miles driven ÷ gallons used on the second fill-up.
What is good gas mileage?
For cars: 25+ MPG is average, 30+ MPG is good, 40+ MPG is excellent. For SUVs: 20+ MPG is average, 25+ is good. Hybrids can achieve 50+ MPG.
How do I convert MPG to L/100km?
L/100km = 235.215 ÷ MPG. For example, 30 MPG = 235.215 ÷ 30 ≈ 7.8 L/100km. Lower L/100km means better fuel efficiency.
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