Fuel Efficiency Converter
Convert between MPG, L/100km, km/L, and other fuel consumption units instantly
Quick Examples
What is a Fuel Efficiency Converter?
A fuel efficiency converter is a tool that helps you convert fuel consumption measurements between different units. Whether you're comparing US MPG (miles per gallon) with European L/100km (liters per 100 kilometers) or trying to understand km/L, this converter makes it easy to switch between different fuel economy standards used around the world.
Understanding fuel efficiency is crucial for comparing vehicles, calculating travel costs, and making informed decisions about fuel economy. Different countries use different measurement systems, which can make international vehicle comparisons confusing without a reliable converter.
Understanding Fuel Efficiency Units
Miles per Gallon (US)
Used primarily in the United States. Higher numbers mean better fuel efficiency. A typical modern car gets 25-30 MPG (US). Uses US gallons (3.785 liters).
Miles per Gallon (UK/Imperial)
Used in the United Kingdom and some Commonwealth countries. Imperial gallons are larger (4.546 liters), so UK MPG values are about 20% higher than US MPG for the same vehicle.
Liters per 100 Kilometers
Standard metric measurement used in most of Europe, Australia, and many other countries. Lower numbers mean better efficiency. A typical car uses 6-8 L/100km.
Kilometers per Liter
Used in some Asian and South American countries. Similar concept to MPG but uses metric units. Higher numbers mean better efficiency.
When to Use This Fuel Efficiency Converter
Buying a Car Internationally
Compare fuel economy specifications when researching vehicles from different countries or considering imports. Convert European L/100km ratings to MPG for easier comparison.
Travel Planning
Calculate expected fuel consumption when renting a car abroad or planning international road trips where fuel efficiency is listed in unfamiliar units.
Vehicle Comparison
Compare fuel economy between different vehicles when specifications are given in different units, helping you make informed purchasing decisions.
Fuel Efficiency Tips
✓ Better Efficiency
- • Maintain steady speeds on highways
- • Keep tires properly inflated
- • Remove unnecessary weight
- • Use cruise control when appropriate
✗ Reduces Efficiency
- • Aggressive acceleration and braking
- • Excessive idling
- • Driving with windows down at high speeds
- • Poor vehicle maintenance
Frequently Asked Questions
What's the difference between US MPG and UK MPG?
The main difference is gallon size. A US gallon is 3.785 liters while a UK (Imperial) gallon is 4.546 liters. This means UK MPG numbers are approximately 20% higher than US MPG for the same vehicle. For example, 30 US MPG equals about 36 UK MPG.
Is higher or lower L/100km better?
Lower is better for L/100km. This unit measures fuel consumption (how much fuel you use), so fewer liters per 100 kilometers means better efficiency. This is opposite to MPG where higher numbers are better.
How accurate is this converter?
This converter uses standard conversion factors and provides accuracy up to 4 decimal places, which is more than sufficient for all practical purposes including vehicle comparison and fuel cost calculations.
What's considered good fuel efficiency?
For modern gasoline cars, good efficiency is typically 30+ US MPG (35+ UK MPG), or under 8 L/100km. Hybrid vehicles often achieve 40-50+ US MPG (5-6 L/100km). Electric vehicles are measured differently using kWh/100km or MPGe.
Can I use this for diesel and gasoline?
Yes! This converter works for any liquid fuel including gasoline (petrol), diesel, ethanol, or biodiesel. The unit conversions remain the same regardless of fuel type, though actual efficiency will vary by fuel.