Fuel Economy Conversions

Fuel economy conversions help compare vehicle efficiency across countries that use incompatible systems. The US rates fuel economy in MPG (miles per gallon); Europe and Australia use L/100km; some Asian countries use km/L. Because MPG and L/100km have an inverse relationship (better efficiency = higher MPG but lower L/100km), direct comparison requires conversion. UK MPG also differs from US MPG because the imperial and US gallons are different sizes.

  • ✓Converting MPG to L/100km for European car comparisons and reviews
  • ✓Converting L/100km to MPG for US car forums, buyers, and import decisions
  • ✓Converting km/L to L/100km for Asia-to-Europe vehicle efficiency comparison
  • ✓Calculating real-world fuel costs and range when renting a car internationally

Most Popular Fuel Economy Conversions

US MPG → L/100kmL/100km → US MPGkm/L → US MPGUS MPG → km/LUK MPG → US MPGL/100km → km/L

All Fuel Economy Converters

Convert from km/L (km/L)

km/L → L/100kmkm/L → MPG (US)km/L → MPG (UK)

Convert from L/100km (L/100km)

L/100km → km/LL/100km → MPG (US)L/100km → MPG (UK)

Convert from MPG (US) (mpg)

MPG (US) → km/LMPG (US) → L/100kmMPG (US) → MPG (UK)

Convert from MPG (UK) (mpg (UK))

MPG (UK) → km/LMPG (UK) → L/100kmMPG (UK) → MPG (US)

Frequently Asked Questions — Fuel Economy

How do I convert MPG (US) to L/100km?
Divide 235.215 by the MPG value to get L/100km. For example, 30 MPG (US) = 235.215 ÷ 30 = 7.84 L/100km. The formula is inverse because more miles per gallon means fewer liters per 100 km.
Is 30 MPG good fuel economy?
30 MPG (US) equals about 7.84 L/100km — above average for a non-hybrid car. A fuel-efficient compact or hybrid typically achieves 35–50 MPG; a midsize sedan averages 25–30 MPG; a large SUV or truck gets 15–22 MPG. EPA ratings for new US vehicles are at fueleconomy.gov.
Why is UK MPG higher than US MPG for the same car?
A UK imperial gallon is 4.546 liters vs the US gallon's 3.785 liters — about 20% larger. So the same car that achieves 35 MPG (US) would be rated approximately 42 MPG (UK). No extra efficiency is involved; the larger UK gallon naturally produces higher numbers.

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