Question 1

How do I convert mpg to liters per 100km?

Accepted Answer

MPG to L/100km uses an inverse relationship, so higher MPG becomes lower L/100km. The converter handles that automatically for both US and UK gallon definitions.

Question 2

What is the difference between US and UK mpg?

Accepted Answer

The UK gallon is larger than the US gallon, so the same vehicle will show a higher number in UK mpg than in US mpg. Always confirm which gallon standard is being used.

Question 3

Is L/100km better lower or higher?

Accepted Answer

Lower is better because it means the vehicle uses less fuel to travel 100 kilometers. This is the opposite of MPG, where higher is better.

Question 4

How do I convert km/L to mpg?

Accepted Answer

Multiply by the appropriate factor depending on whether you want US or UK mpg. The page makes that distinction explicit to avoid incorrect comparisons.

Question 5

What is good fuel economy in L/100km?

Accepted Answer

It depends on the vehicle type, but lower values generally mean better efficiency. Small efficient cars may be well under 6 L/100km, while larger trucks and SUVs are usually higher.

From	To
30 Miles per Gallon (US)	7.840486 Liter per 100 km
40 Miles per Gallon (UK)	7.062023 Liter per 100 km
8 Liter per 100 km	29.40182 Miles per Gallon (US)
10 Liter per 100 km	10 Kilometer per Liter
50 Miles per Gallon (US)	21.25719 Kilometer per Liter
25 Miles per Gallon (US)	30.02375 Miles per Gallon (UK)
5 Liter per 100 km	47.04292 Miles per Gallon (US)
15 Kilometer per Liter	35.28219 Miles per Gallon (US)

Fuel Consumption

Common conversions

Frequently asked questions

Related converters