Gas Mileage Calculator (MPG)
Calculate your vehicle's fuel efficiency in MPG or L/100km. Track gas costs per mile, compare vehicles, and estimate trip fuel costs based on current gas prices.
2 minutes Easy
How to Use This Calculator
- Choose your calculation mode - Basic MPG, Trip Planner, or Vehicle Comparison
- Enter odometer readings or miles driven - Input your start/end readings or total distance
- Input fuel usage - Gallons or liters used during the trip
- Add gas price - Current price per gallon/liter for cost calculations
- Click Calculate to see your fuel efficiency, costs, and environmental impact
Calculation Mode
Distance Traveled
miles
Fuel Used
gallons
Amount of fuel consumed
$
/gal
Current price per gallon/liter
Annual Driving (Optional)
miles/yr
For annual cost and CO2 estimates
Fuel Log (Optional)
Track multiple fill-ups to calculate your average fuel economy over time.
⛽ Understanding Fuel Economy
Fuel economy measures how efficiently your vehicle uses fuel. It can be expressed as:
- MPG (Miles Per Gallon): Higher is better. Used in the US.
- L/100km (Liters per 100 kilometers): Lower is better. Used in Europe, Canada, Australia.
- km/L (Kilometers per Liter): Higher is better. Used in some Asian countries.
🌱 Tips for Improving Fuel Economy
- Maintain proper tire pressure: Under-inflated tires can reduce MPG by 0.2% per 1 PSI drop
- Drive steadily: Aggressive acceleration and braking wastes fuel
- Remove excess weight: Every 100 lbs reduces MPG by about 1%
- Use cruise control: Maintaining steady speed on highways saves fuel
- Avoid excessive idling: Idling gets 0 MPG
- Keep engine tuned: A properly tuned engine improves MPG by 4%
- Use recommended motor oil: Correct grade can improve MPG by 1-2%
- Plan routes: Combine errands and avoid heavy traffic when possible
- Slow down: Every 5 mph over 50 mph costs roughly $0.20/gallon more
- Keep windows closed at highway speeds: Open windows increase drag
🌍 CO2 Emissions Facts
- Each gallon of gasoline produces approximately 19.6 lbs (8.89 kg) of CO2
- Each gallon of diesel produces approximately 22.4 lbs (10.16 kg) of CO2
- The average US passenger vehicle emits about 4.6 metric tons of CO2 per year
- Improving fuel economy by just 5 MPG can save over 1,000 lbs of CO2 annually
🔗 Save & Share
Your calculation is saved in the URL. Bookmark this page or use the Share button to send it to others.
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