Fuel Efficiency Converter

Convert between different units of fuel efficiency - MPG, L/100km, km/L, and more.

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What It Does

A Fuel Efficiency Converter is a practical tool for converting between different units of fuel economy and consumption. It converts between US MPG (miles per gallon), UK MPG (imperial gallons), L/100km (liters per 100 kilometers - European standard), km/L (kilometers per liter), and miles/L (miles per liter). This tool is essential for comparing vehicle fuel economy across different regions, understanding fuel consumption when traveling internationally, calculating fuel costs, and evaluating vehicle efficiency. It handles the inverse relationship between MPG and L/100km (higher MPG = lower L/100km). Perfect for car buyers comparing vehicles, travelers understanding fuel economy in different countries, fleet managers calculating fuel costs, and anyone working with vehicle efficiency metrics.

Key Features:

  • Convert between 5 common fuel efficiency units (MPG US, MPG UK, L/100km, km/L, miles/L)
  • Real-time conversion as you type - instant results
  • Swap button to quickly reverse conversion direction
  • High precision results with up to 2 decimal places
  • Handles inverse relationship: MPG vs L/100km
  • US and UK MPG support (different gallon sizes)
  • European standard: L/100km for fuel consumption
  • Mobile-responsive design for on-the-go conversions

How To Use

Convert fuel efficiency instantly between different units. Perfect for comparing vehicles, understanding fuel economy, and calculating fuel costs.

1

Enter the Fuel Efficiency Value

Type or paste the fuel efficiency value you want to convert into the "Value" input field. You can enter whole numbers or decimals (e.g., 30, 7.5, 0.08).

2

Select Source Unit

Choose the unit you're converting FROM using the "From" dropdown. Options include MPG (US), MPG (UK), L/100km, km/L, and miles/L.

3

Select Target Unit

Choose the unit you want to convert TO using the "To" dropdown. The result updates automatically as you make your selection.

4

View Result

See the converted fuel efficiency value displayed prominently in the result box. The conversion happens in real-time as you type or change units.

5

Swap Units (Optional)

Click the swap button (⇄) to instantly reverse the conversion direction, swapping the "From" and "To" units without re-entering the value.

Pro Tips

  • •Higher MPG = better fuel economy (more miles per gallon)
  • •Lower L/100km = better fuel economy (less fuel per 100 km)
  • •US gallon (3.785 L) is smaller than UK gallon (4.546 L)
  • •30 MPG (US) ≈ 7.84 L/100km
  • •10 L/100km ≈ 23.52 MPG (US)
  • •European vehicles typically use L/100km
  • •US vehicles typically use MPG

Benefits

Vehicle Comparison: Compare fuel economy across different unit systems
Travel: Understand fuel economy when driving in different countries
Cost Calculation: Convert fuel efficiency for cost per mile/kilometer calculations
Fleet Management: Convert efficiency metrics for fleet analysis
Education: Learn fuel economy relationships and unit conversions
Accuracy: Eliminate manual calculation errors in efficiency conversions
Time Saving: Instant conversions save time over manual calculations
International: Convert between US, UK, and European fuel economy standards

Use Cases

Vehicle Comparison

Compare fuel economy between vehicles using different measurement systems. US vehicles use MPG, while European vehicles use L/100km.

Convert 35 MPG (US) to L/100km (6.72 L/100km) to compare with European vehicles

International Travel

Understand fuel economy when driving in different countries. Convert between local fuel economy units for trip planning.

Convert 8 L/100km to MPG (US) (29.40 MPG) when traveling in Europe

Fuel Cost Calculation

Convert fuel efficiency for calculating fuel costs per distance. Different units help with cost analysis in different regions.

Convert 30 MPG to L/100km (7.84 L/100km) to calculate fuel cost per 100 km

Fleet Management

Convert fuel efficiency metrics for fleet analysis and reporting. Fleet managers may need to work with different unit systems.

Convert fleet average 25 MPG to L/100km (9.41 L/100km) for international reporting

Environmental Impact

Convert fuel efficiency to understand environmental impact. Lower L/100km means less fuel consumption and lower emissions.

Convert 5 L/100km to MPG (US) (47.04 MPG) to understand high efficiency

Frequently Asked Questions

1 What is the difference between US MPG and UK MPG?
US MPG uses US gallons (3.78541 liters), while UK MPG uses imperial gallons (4.54609 liters). Since UK gallons are larger, the same vehicle will show higher MPG in UK units than US units. For example, a vehicle getting 30 MPG (US) would show 36.04 MPG (UK). This is why it's important to specify which gallon system is being used when comparing fuel economy.
2 How do I convert MPG to L/100km?
To convert MPG (US) to L/100km, use the formula: L/100km = 235.214 ÷ MPG. For example, 30 MPG (US) = 235.214 ÷ 30 = 7.84 L/100km. To convert L/100km to MPG (US), use: MPG = 235.214 ÷ L/100km. For example, 8 L/100km = 235.214 ÷ 8 = 29.40 MPG. The converter handles this inverse relationship automatically.
3 Why does Europe use L/100km instead of MPG?
L/100km (liters per 100 kilometers) is the European standard because it directly shows fuel consumption rather than efficiency. Lower L/100km means less fuel used, making it easier to understand consumption. MPG shows efficiency (more is better), while L/100km shows consumption (less is better). Both systems are valid, but L/100km is more intuitive for understanding actual fuel usage.
4 What is a good fuel economy rating?
Fuel economy ratings vary by vehicle type. For passenger cars: Excellent: >40 MPG (US) or <6 L/100km, Good: 30-40 MPG or 6-8 L/100km, Average: 20-30 MPG or 8-12 L/100km, Poor: <20 MPG or >12 L/100km. For SUVs and trucks, ratings are typically lower. Electric vehicles use different metrics (kWh per 100 km or miles per kWh). Always compare vehicles of similar size and type.
5 How do I calculate fuel cost from efficiency?
To calculate fuel cost: First convert efficiency to consumption (L/100km or gallons per 100 miles). Then multiply by fuel price. Example: Vehicle gets 30 MPG (US) = 7.84 L/100km. At $1.20/L, cost per 100 km = 7.84 × $1.20 = $9.41 per 100 km. Or: 30 MPG means 3.33 gallons per 100 miles. At $3.50/gallon, cost = 3.33 × $3.50 = $11.66 per 100 miles.
6 Can I convert between km/L and L/100km?
Yes, km/L and L/100km are inverse units. To convert km/L to L/100km: L/100km = 100 ÷ km/L. For example, 15 km/L = 100 ÷ 15 = 6.67 L/100km. To convert L/100km to km/L: km/L = 100 ÷ L/100km. For example, 8 L/100km = 100 ÷ 8 = 12.5 km/L. Higher km/L means better efficiency, just like higher MPG.

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