Question 1

How do I convert MPG to L/100km?

Accepted Answer

Divide 235.21 by the MPG value to get L/100km. For example, 30 MPG = 235.21 ÷ 30 = 7.84 L/100km. Note: this applies to US gallons. For UK MPG, divide 282.48 instead.

Question 2

What is better — higher MPG or lower L/100km?

Accepted Answer

Higher MPG is better (more miles per gallon). Lower L/100km is better (fewer litres burned per 100 km). Both represent greater fuel efficiency — they are just expressed inversely.

Question 3

What is the difference between US and UK MPG?

Accepted Answer

A US gallon is 3.785 litres; a UK (imperial) gallon is 4.546 litres. So 30 MPG US ≈ 36 MPG UK. Always check which gallon is being used when comparing international car specs.

Question 4

What is a good fuel economy?

Accepted Answer

For passenger cars: above 35 MPG US (under 6.7 L/100km) is considered good. Hybrid cars often achieve 45–60 MPG. Electric vehicles are rated in miles per kWh, a different metric.

Fuel Economy Converter — MPG, L/100km, km/L

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