MPG stands for miles per gallon and is one of the most common ways to measure a car’s fuel economy. In simple terms, MPG tells you how many miles a vehicle can travel using one gallon of fuel. The higher the MPG figure, the more fuel-efficient the car is considered to be.
Fuel economy is an important factor for many drivers because it directly affects running costs. Cars with better MPG typically cost less to fuel over time, making them more affordable to own and drive.
How MPG Figures Are Calculated
Modern vehicles are tested under controlled conditions to produce official MPG figures. These tests are designed to simulate different types of driving, including city driving, suburban roads, and motorway journeys.
Most manufacturers now use WLTP testing standards, which aim to provide more realistic fuel economy figures compared to older testing methods. Even so, real-world MPG can still vary depending on how and where you drive.
Official MPG figures are usually displayed as:
- Urban or city driving MPG
- Extra urban or motorway MPG
- Combined MPG
The combined MPG figure is generally the one most drivers pay attention to because it represents mixed driving conditions.
Why MPG Is Important
A car’s MPG matters because it affects both fuel costs and overall running expenses. Vehicles with better fuel economy can travel further using less fuel, helping drivers save money over time.
Good MPG can also reduce emissions, making vehicles more environmentally friendly. This is one reason why manufacturers continue to improve fuel efficiency through hybrid technology, smaller turbocharged engines, and lighter vehicle designs.
For drivers covering high annual mileage, choosing a car with strong MPG figures can make a significant difference to yearly running costs.
Can Your Driving Affect MPG?
Yes — driving style has a major impact on fuel economy. Aggressive acceleration, harsh braking, excessive idling, and speeding can all reduce your MPG considerably.
Driving smoothly and maintaining a steady speed often improves fuel efficiency. Simple habits such as avoiding unnecessary weight in the vehicle, removing unused roof racks, and keeping tyres properly inflated can also help improve MPG.
Regular vehicle maintenance is equally important. Poorly maintained engines, low tyre pressure, or overdue servicing can all negatively affect fuel economy.
What Is Considered Good MPG?
What counts as “good MPG” depends on the type of vehicle. Smaller petrol cars may achieve over 50 MPG, while larger SUVs or performance vehicles often return lower figures due to their size and engine power.
As a general guide:
- 50+ MPG is considered very fuel efficient
- 35–50 MPG is considered good
- Under 30 MPG is usually considered less economical
Hybrid vehicles can often achieve even higher MPG figures, particularly in urban driving conditions.
Which Cars Tend to Have Better MPG?
Smaller hatchbacks, hybrid vehicles, and efficient diesel models generally offer the best MPG. Cars designed for lower running costs are often lighter, more aerodynamic, and fitted with smaller engines.
When comparing vehicles, it’s important to consider your own driving habits. Someone regularly driving long motorway distances may prioritise different fuel economy characteristics compared to someone mainly driving around town.
You can also explore more vehicle ownership advice and running cost guides here within our maintenance guidance hub.
Improving Your Car’s Fuel Economy
There are several ways to improve your car’s MPG and reduce fuel costs:
- Keep tyres inflated correctly
- Drive smoothly and avoid harsh acceleration
- Reduce unnecessary weight in the vehicle
- Service your car regularly
- Avoid excessive idling
- Use cruise control on longer motorway journeys where appropriate
Even small improvements in fuel efficiency can save money over the course of a year.
Related articles you may also find useful:
If rising fuel costs and poor MPG are making your vehicle expensive to run, it may be worth checking how much your car is currently worth. You can get a quick online valuation using our free online valuation tool right here.