MPG is an abbreviation of ‘Miles Per Gallon’.
The higher the MPG, the more miles you can travel on one gallon of fuel. This means that a car with a higher MPG will be more cost effective to run than one with a lower MPG.
A gallon is equivalent to 4.55 Litres in the UK. Therefore if a car does 45mpg, each gallon of fuel the car consumes will enable you to travel 45 miles before the car runs out of fuel.
You can read more about MPG here: