What fuel economy units can I convert between?

You can convert between MPG (US), MPG (Imperial), L/100km (liters per 100 kilometers), and km/L (kilometers per liter) for comprehensive international comparison.

What's the difference between US and Imperial MPG?

US MPG uses US gallons (3.785 liters) while Imperial MPG uses UK gallons (4.546 liters), so Imperial MPG numbers are about 20% higher than US MPG for the same efficiency.

Can I calculate fuel costs with this tool?

Yes, the converter includes fuel cost calculation features to help estimate expenses and compare operating costs between different vehicles.

Is the fuel economy converter free?

Yes, this comprehensive fuel economy converter is completely free with no registration required. Perfect for international travelers, car shoppers, and fuel efficiency analysis.

Free Online Fuel Economy Converter (No Signup)

Free Online Fuel Economy Converter (No Signup) – FreeWWW

🔄 Unit Converter

Enter Value (any fuel economy number)

From Unit

To Unit

⚠️

✓

Converted Value

—

km/L

Efficiency Rating

—

Rating

💰 Fuel Cost Calculator

Enter fuel economy above, then calculate trip costs below.

Fuel Price

Price Unit

Trip Distance

Distance Unit

Currency

Fuel Needed

—

gallons (US)

Total Trip Cost

—

USD

Cost per Unit Distance

—

per mile

📊 Quick Reference Table

Common fuel economy values across different measurement systems. Your conversion appears highlighted at the top.

MPG (US)	MPG (UK)	km/L	L/100km	Rating

⚖️ Compare Two Vehicles

Enter each vehicle's fuel economy to see which is cheaper to run over your typical annual distance.

Economy unit:

🚗 Vehicle A

Name

Economy (MPG US)

🚙 Vehicle B

Name

Economy (MPG US)

Annual Distance

Distance Unit

Fuel Price

Price Unit

⛽ Fill-Up Log & Running Average

Record each fill-up to track real-world economy. Enter the distance driven since the last fill-up and the fuel added. Saved on this device only.

Units:

Date

Distance (miles)

Fuel Added (gallons US)

Fill Cost (optional)

⚠️

No fill-ups logged yet. Add one above to start tracking your real-world fuel economy.

💡 Fuel Efficiency Tips

🚗

Maintain Steady Speeds Use cruise control on highways to maintain consistent speed and improve fuel economy by up to 14%.

🔧

Keep Tires Inflated Under-inflated tires can reduce fuel economy by up to 3%. Check pressure monthly.

📦

Remove Excess Weight Every 100 pounds (45 kg) of extra weight can reduce efficiency by about 1%.

🛠️

Regular Maintenance Clean air filters, proper oil changes, and tune-ups keep your engine running efficiently.

🗺️

Plan Your Trips Combine errands into one trip to reduce cold starts and warm-up fuel consumption.

⏱️

Avoid Excessive Idling Turn off your engine if you'll be stopped for more than 30 seconds to save fuel.

🚗 Fuel Economy Converter

🔄 Unit Converter

Converted Value

Efficiency Rating

💰 Fuel Cost Calculator

Fuel Needed

Total Trip Cost

Cost per Unit Distance

📊 Quick Reference Table

⚖️ Compare Two Vehicles

🚗 Vehicle A

🚙 Vehicle B

⛽ Fill-Up Log & Running Average

Average Economy

Total Distance

Total Fuel

Total Spent

💡 Fuel Efficiency Tips

🔄 Unit Converter

Converted Value

Efficiency Rating

💰 Fuel Cost Calculator

Fuel Needed

Total Trip Cost

Cost per Unit Distance

📊 Quick Reference Table

⚖️ Compare Two Vehicles

🚗 Vehicle A

🚙 Vehicle B

⛽ Fill-Up Log & Running Average

Average Economy

Total Distance

Total Fuel

Total Spent

💡 Fuel Efficiency Tips

🔗 Share Conversion