Question 1

How do I calculate my MPG?

Accepted Answer

To calculate your MPG, fill the tank with petrol or diesel, note the mileage, drive normally, then refill it and record the litres used and miles covered. Divide the distance travelled by the fuel amount after converting litres into imperial gallons; this simple measure gives your MPG figure. A calculator or converter can also work well: enter the values, click the button, and get the results, then round the result to one decimal place.

Question 2

What is my miles per gallon?

Accepted Answer

Your miles per gallon is the number produced when the miles travelled are divided by the gallons consumed, showing how far your vehicle can travel with a gallon of fuel. A higher MPG generally indicates better overall fuel efficiency, lower running costs, and greater savings. For a dependable figure, check several tanks across a longer period, as traffic, driving style, weather, and your usual route can change the outcome.

Question 3

What is 60 MPG in litres per 100km?

Accepted Answer

Using the UK imperial standard, 60 MPG equals approximately 4.7 L/100km. Under the US gallon standard, 60 MPG equals approximately 3.9 L/100km, so the correct result depends upon the gallon definition being applied. For most UK vehicle comparisons, 4.7 L/100km is the relevant figure.

Question 4

What is a good MPG for a petrol car?

Accepted Answer

As a practical guide, around 40–50 imperial MPG is considered reasonably good for a modern petrol car, while more than 50 MPG indicates strong fuel efficiency; below approximately 35 MPG may still be normal for a larger or performance-focused make and model. Compare the figure across different road conditions and a normal driving cycle, then recalculate it over several months. Regular service and maintenance may also improve efficiency and produce an improved long-term average.

Fuel Efficiency

Free MPG Calculator – Instant Fuel Economy Check