Fuel Economy Conversions — km/l to mpg, mpg to km/l, l/100km to mpg
Quick fuel economy conversions for comparing vehicle efficiency worldwide. Convert
km/l to mpg, mpg to km/l, l/100km to mpg,
and between US and UK gallons. Essential for car buyers, travelers, and efficiency comparisons.
⛽ Key Concept: Fuel economy measures how far a vehicle travels per unit of fuel.
Higher mpg or km/l = better efficiency. Lower l/100km = better efficiency.
Unit descriptions
km/lKilometers per liter (km/l)
Common in metric countries. Measures how many kilometers a vehicle travels on one liter of fuel. Higher number = better efficiency.
USMiles per gallon US (mpg US)
Standard in the United States. Measures miles traveled per US gallon (3.785 liters). Used for EPA fuel economy ratings.
UKMiles per gallon UK (mpg UK)
Used in United Kingdom and some Commonwealth countries. Uses imperial gallon (4.546 liters). 1 UK mpg = 1.201 US mpg.
l/100kmLiters per 100 km (l/100km)
Common in Europe, Australia, China. Measures fuel consumption rather than economy. Lower number = better efficiency.
Browse Fuel Economy Conversions
Fuel Economy Conversion Tables
1 km/l
= 2.352 mpg US · = 2.825 mpg UK · = 100 l/100km (inverse)
1 mpg US
= 0.425 km/l · = 1.201 mpg UK · = 235.2 l/100km (inverse)
1 mpg UK
= 0.354 km/l · = 0.833 mpg US · = 282.5 l/100km (inverse)
1 l/100km
= 100 km/l (inverse) · = 235.2 mpg US (inverse)
Conversion Formula
mpg US = km/l × 2.352 · km/l = mpg US × 0.425
UK vs US Gallon
1 UK gallon = 4.546 liters · 1 US gallon = 3.785 liters
🔄 Inverse Relationship: km/l and mpg are directly proportional (higher = better).
l/100km is inversely proportional (lower = better). To convert l/100km to mpg: mpg = 235.2 ÷ (l/100km)
Common Vehicle Fuel Economy Examples
Toyota Prius (Hybrid)
23 km/l · 54 mpg US · 65 mpg UK · 4.3 l/100km
Honda Civic (Gasoline)
15 km/l · 35 mpg US · 42 mpg UK · 6.7 l/100km
Ford F-150 (Truck)
8 km/l · 19 mpg US · 23 mpg UK · 12.5 l/100km
Tesla Model 3 (Electric)
Equivalent: 28 km/l · 66 mpg US · 79 mpg UK · 3.6 l/100km
Typical SUV
10 km/l · 24 mpg US · 29 mpg UK · 10 l/100km
Motorcycle
25 km/l · 59 mpg US · 71 mpg UK · 4 l/100km
Fuel Economy Standards by Country
United States
Uses mpg US · Corporate Average Fuel Economy (CAFE) standards
European Union
Uses l/100km · WLTP testing cycle · Targets around 4-5 l/100km
United Kingdom
Uses mpg UK · Similar to EU efficiency standards
Japan
Uses km/l · JC08 test cycle · Leading in hybrid efficiency
India
Uses km/l · Bharat Stage emissions standards
Australia
Uses l/100km · Similar to European standards
Fuel Cost Calculations
Fuel Price: $3.50/US gallon
30 mpg = $0.117/mile · 20 mpg = $0.175/mile · 10 mpg = $0.35/mile
Fuel Price: €1.50/liter
15 km/l = €0.10/km · 10 km/l = €0.15/km · 5 km/l = €0.30/km
Annual Driving: 15,000 km
At 10 km/l: 1,500 liters · At 15 km/l: 1,000 liters (500L saved)
Trip: 500 km journey
At 10 l/100km: 50 liters · At 6 l/100km: 30 liters (20L saved)
Fuel Efficiency Categories
Excellent Efficiency A+
> 25 km/l · > 59 mpg US · < 4 l/100km (Hybrids, small EVs)
Very Good A
18-25 km/l · 42-59 mpg US · 4-5.5 l/100km (Efficient sedans)
Good B
13-18 km/l · 31-42 mpg US · 5.5-7.5 l/100km (Average cars)
Average C
10-13 km/l · 24-31 mpg US · 7.5-10 l/100km (SUVs, trucks)
Poor D
< 10 km/l · < 24 mpg US · > 10 l/100km (Large SUVs, sports cars)
⚠️ Real-World vs Official Ratings: Official fuel economy tests often overestimate real-world efficiency by 10-40%.
Factors like driving style, traffic, weather, and air conditioning significantly affect actual fuel consumption.
Improving Fuel Economy Tips
Proper Tire Pressure
Improves efficiency by 0.6-3% · Check monthly
Smooth Acceleration
Saves 10-40% vs aggressive driving · Anticipate traffic
Reduce Speed
Driving 120 km/h vs 100 km/h increases consumption 20%
Remove Excess Weight
100 kg extra = 6-7% more fuel in city driving
Regular Maintenance
Clean air filter: 10% improvement · Proper oil: 1-2%
Plan Efficient Routes
Avoid traffic · Combine trips · Use cruise control
Electric Vehicle Equivalent
MPGe (Miles Per Gallon Equivalent)
33.7 kWh = energy in 1 gallon of gasoline · Used for EV efficiency
Tesla Model 3
141 MPGe · 24 kWh/100 miles · Equivalent to 1.7 l/100km
Nissan Leaf
111 MPGe · 30 kWh/100 miles · Equivalent to 2.1 l/100km
Conversion
1 MPGe = 0.425 km/l equivalent · = 235.2 l/100km equivalent
Remember: 1 US gallon = 3.785 liters, 1 UK gallon = 4.546 liters. When comparing UK and US mpg,
UK figures are about 20% higher due to the larger imperial gallon. Always check which gallon system is being used.