Question 1

What is a good MPG or L/100km for a car?

Accepted Answer

USA: above 30 MPG is generally good for a petrol car. Australia: below 8 L/100km is considered efficient. Hybrids achieve 45–55 MPG (roughly 5–6 L/100km). SUVs and trucks range from 15–25 MPG (roughly 9–16 L/100km).

Question 2

How do I measure real-world fuel economy?

Accepted Answer

Fill up your tank completely and note the odometer. Drive normally. Fill up again and record gallons (USA) or litres (Australia) used and new odometer reading. USA: divide miles driven by gallons used. Australia: divide litres used by km driven, then multiply by 100.

Question 3

Does this calculator support Australian litres and km?

Accepted Answer

Yes. Select the Australia preset to enter distance in km and fuel in litres. The primary result will show L/100km, which is the standard fuel consumption measure used in Australia.

Unit	Region	Better when
MPG (Miles per Gallon)	USA, UK	Higher is better
L/100km (Litres per 100km)	Australia, Europe, Canada	Lower is better
km/L (Kilometers per Liter)	Japan, India	Higher is better

Fuel Economy Calculator

Trip Data

Understanding Fuel Economy Units