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Average MPG for Cars UK 2021

While not everyone realises it, buying a car with great fuel efficiency can be a fantastic way to save on the annuals costs to run a car, especially if you put a lot of miles on your car—most car owners spend around £1,000 on fuel each year. How many miles does the car get between each visit to the petrol station—and is that level of fuel efficiency any good?

Below we've calculated the average miles per gallon (mpg) for petrol and diesel cars—and miles per gallon equivalent (MPGe) for hybrid and electric cars—to give you a benchmark for understanding how fuel efficient any given car is. While buying a car with better fuel economy is the best way to save money at the pump, you can also read our top tips for improving fuel efficiency in your vehicle.

Average Miles per Gallon

The average MPG for cars in the UK is 38.8 miles per gallon. Fuel efficiency varies by type of fuel, however, with petrol cars getting 36 mpg and diesel cars getting 43 mpg. In contrast, the average UK all-electric car gets a whopping 132 MPGe.

To determine average miles per gallon, we analysed real-life user data from Spritmonitor, which enables users to track and calculate fuel efficiency for their personal cars. The resulting database contains over 30 million fuel ups for over 800 thousand vehicles. From this database, we extracted real-life fuel usage data from the past year for petrol, diesel, hybrid and electric cars.

Average MPG or MPGe, by fuel type
Gasoline36 MPG
Diesel43 MPG
Hybrid Gasoline59 MPG
Electric132 MPGe

In contrast to cars, the fuel efficiency of motorcycles is much better—the average motorcycle get 56.7 mpg!

MPGe for Popular UK Electric Cars

The Peugeot iOn is the most efficient electric car in the UK, achieving a remarkable 159 MPGe. The Audi e-tron is the worst of the group but still achieves 93 MPGe, which is nearly 3X better than the average petrol car in the UK.

We calculated the MPGe for all-electric cars specifically available in the UK, including models from BMW, Nissan, Tesla, Mitsubishi, VW, Citroen, Fiat, Hyundai, Renault, Audi and Mercedes.

Electric Car MPGe

Average MPGe for UK Electric Cars
Peugeot iOn159
Hyundai Ioniq Electric158
Mitsubishi i-MiEV153
VW eUp153
Citroen C-Zero147
VW eGolf146
BMW i3145
Hyundai Kona Electric143
Nissan Leaf142
Fiat 500e137
Renault Zoe137
Kia e-Niro137
Kia Soul EV131
Tesla Model 3119
Tesla Model S107
Mercedes B250e102
Tesla Model X95
Audi e-tron93


The average car gets 38.8 miles to the gallon in the UK—with petrol-fueled cars getting 36 mpg and diesel cars getting 43 mpg. All-electric cars get a mpg equivalent of 132 MPGe.
The average UK car drives 38.8 miles to the gallon. Petrol cars average around 36 mpg, diesel cars average around 43 mpg and all-electric cars get the equivalent of 132 MPGe.
Assuming you'll consider "better than average" to be good, then look for a car getting at least 36 miles per gallon. For diesel, you'll want at least 43 mpg.


Spritmonitor database entries are stored as litres/100km for petrol and diesel cars and kWh/100km for electric cars. For use in the UK, we converted these values into miles per gallon (Imperial) or a miles per gallon equivalent (MPGe) for electric cars. To calculate the overall miles per gallon metric, we took a weighted average of petrol and diesel figures using the number of petrol and diesel cars in the UK.

To calculate MPGe for electric cars, we calculated how many miles a car can drive on average for an amount of electricity that's equivalent in cost to a gallon of fuel. Here are the average fuel costs we used:

Average Fuel Costs
Gasoline£1.24 per litre
Diesel£1.30 per litre
Electricity£0.163 per kWh