About Author
Sofia Modiri Dockery
I research and write blogs on what’s happening in the EV-world.
A typical petrol car in the UK can emit around 4.6 tonnes of CO₂ per year, depending on mileage. That’s the equivalent of several long-haul flights produced simply by commuting, school runs, and everyday activities.
In this blog, we’ll look at how emissions compare across petrol, diesel, and electric vehicles, explain why official figures can be confusing, and break down what emissions really look like in the real world. Understanding emissions isn’t just about being environmentally conscious; it can also help drivers reduce fuel costs and make smarter choices about their next vehicle.
What is CO₂, and Why Does It Matter?
In simple terms, car CO2 emissions measure how much carbon dioxide your vehicle releases into the atmosphere while driving. The more fuel a car burns, the more CO2 it produces. Over time, those small numbers add up and affect our climate.
Transport, including road, aviation, and shipping, is responsible for around a third of the UK’s greenhouse gas emissions and is therefore one of the largest contributors to emissions in the UK. What makes this significant is how closely emissions are tied to everyday behaviour. The type of car you drive, how many miles you travel, and how efficiently your vehicle uses fuel all influence the amount of CO2 produced.
Tighter regulations are increasingly reflecting this. ULEZ zones and company car tax rates are now linked directly to vehicle emissions. Put simply, lower emissions often mean lower taxes and lower running costs.
Petrol and Diesel Cars: A Hidden Carbon Cost
Most drivers know that petrol and diesel vehicles produce emissions, but the scale of those emissions over time is often misjudged.
On average:
- Petrol cars: around 230g of CO2 per mile
- Diesel cars: roughly 278g of CO2 per mile
Diesel vehicles typically emit more nitrogen oxides and particulates, which lead to poorer air quality.
The figures shown by manufacturers are usually based on WLTP testing, a standardised lab procedure used to measure fuel economy and emissions.
WLTP is measured to match how consumers drive, so it is more realistic than older testing methods. Real-world driving conditions still tend to produce higher emissions. Factors such as traffic, harsh acceleration, cold starts, and short journeys all increase fuel consumption. For example, a driver covering 10,000 miles annually in a typical petrol car could produce just over 2 tonnes of CO₂.
Small habits also play a role. Frequent idling, short trips, and inefficient driving can significantly increase emissions without drivers even realising it.
What About EV’s?
Electric vehicles are often described as “zero emission,” but that phrase can be misleading if taken out of context. EVs produce zero tailpipe emissions. Because they don’t burn fuel, they release no CO₂ while driving. However, battery production and generating electricity both involve energy use, which can create emissions depending on the source. This is where the concept of lifecycle emissions comes in.
Lifecycle emissions are the total emissions produced throughout the life of a product or service. Tailpipe emissions are pollutants from the vehicle’s exhaust. EV’s have zero tailpipe emissions because they lack exhaust pipes, engines, and fuel tanks.
In the UK, renewable energy sources such as wind and solar now contribute a growing share of electricity generation. This means that EVs effectively become cleaner over time as the grid decarbonises. So while EV’s may not be perfectly emission-free across their entire lifecycle, they still represent a major reduction in CO₂ output compared with petrol or diesel vehicles.
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The Truth About Going Electric
Although EVs start with higher manufacturing emissions due to battery production, once they’re on the road, they quickly pay back their carbon debt.
When comparing the whole life emissions of an EV to a petrol/diesel car, the difference becomes clear. This is a side-by-side comparison of EV vs Petrol and Diesel, measured in tonnes of CO₂.
CO₂ Emissions | 1 Year | 3 Years | 5 Years | 7 Years | 10 Years |
Petrol/Diesel | 16 tonnes | 22 tonnes | 38 tonnes | 50 tonnes | 64 tonnes |
EV | 17 tonnes | 19 tonnes | 22 tonnes | 24 tonnes | 32 tonnes |
Switching to electric has many benefits for high-mileage drivers. Drivers can make significant cost savings as they replace expensive petrol with cheaper electricity. Also, in major cities like London, EV drivers are exempt from the congestion charge, therefore benefiting from cost savings.
Urban driving often involves frequent stopping and starting, which can reduce fuel efficiency in petrol or diesel cars. EV’s use regenerative braking, which captures energy normally lost during braking and feeds it back into the battery. This means EVs often perform more efficiently in stop-start traffic than petrol or diesel engines. Stop-start traffic can also accelerate wear on components like clutches, brakes, and gearboxes in traditional vehicles.
Real Savings from Real Drivers
We recently surveyed our drivers about their switch to electric motoring. This included what they drove before, their annual mileage, and how many CO2 emissions they have saved. Their answers have shaped a picture of the real-world impact of electric vehicles in the UK.
Fuel vs Electricity Expenses
For a lot of drivers, the biggest savings come from switching from fuel to electricity. Charging at home usually costs much less than topping up a petrol or diesel tank. If drivers utilise cheaper overnight electricity rates, the savings can be even greater. Over average UK driving distances, this often means saving hundreds or even thousands of pounds annually on energy expenses alone.
Public charging can be pricier than home charging, but most drivers say that they still do most of their charging at home or work, which helps keep overall costs lower than conventional refuelling.
Lower Emissions, Lower Running Costs
The environmental advantages are obvious, but many drivers also realise that the same elements that cut down emissions often lead to lower costs as well.
Electric vehicles emit no tailpipe pollutants and typically boast much greater energy efficiency compared to traditional combustion engine cars. This translates to less energy being wasted and more distance covered per energy unit consumed. In practical terms, this efficiency sheds light on why drivers are experiencing both reduced CO₂ emissions and decreased daily operating expenses. This isn’t just theoretical or based on models. These are actual outcomes from real drivers.
Maintenance Differences
Another way to save is through maintenance. Electric cars don’t have engine oil, exhaust systems, or clutches, and they have fewer moving parts that tend to wear out over time. Because of this, drivers spend less on servicing and maintenance than they did with their previous cars. Over the lifespan of a vehicle, these savings can really add up.
The role of company car and salary sacrifice schemes
The drivers we surveyed are accessing EVs through our salary sacrifice scheme. These types of schemes can dramatically cut the cost of driving electric, with low Benefit in Kind tax rates, and insurance, servicing, tyres, and more included in their monthly price.
When you put together lower taxes, electricity over fuel, and no maintenance costs, the overall cost of driving an EV can actually be quite competitive.
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What our Drivers are Seeing
The key point from the survey is that these savings aren’t just theoretical estimates or claims from manufacturers. We calculated that the typical electric car driver saves 4.04 tonnes of CO2 over their three-year term (or 1.27 tonnes of CO2 per year).
The shift to electric vehicles isn’t only about the future of transportation. It’s already providing tangible benefits for drivers right now.
It’s Not Just About the Planet – It’s Practical, Too
For a lot of drivers, the attraction to electric vehicles goes beyond just emissions. EVs come with a bunch of practical benefits for everyday driving. They’re quieter, provide instant torque for smooth acceleration, and offer a unique driving experience compared to traditional engines.
Charging can also be super convenient, especially for those who can charge at home. Plugging in overnight means you can start each day with a full battery, which eliminates the need for frequent trips to the petrol station. And with the average UK commute being just under 20 miles, you won’t even need to charge up every night.
Low emissions can also lead to tax benefits and incentives, especially for those driving company cars. Plus, since electricity prices are generally more stable than fuel prices, many EV drivers find their monthly expenses easier to predict.
For both commuters and fleets, these reasons often make the switch as much about practicality as it is about sustainability.
Thinking About Making the Switch?
Switching to an electric vehicle isn’t just about being totally “green.” For a lot of drivers, it really comes down to whether an EV suits their daily mileage, driving habits, and charging availability.
If your trips are mostly predictable, like commuting, school runs, or regular work travel, an electric vehicle can usually fit right into your current routine. Knowing how emissions stack up between different vehicle types can also clear up where you might save the most on fuel costs and reduce CO2 emissions.
At Fleet Evolution, the aim isn’t to push drivers into making a switch; it’s to assist them in understanding the choices out there and selecting the vehicle that best meets their needs.
If you’re interested in seeing what difference an EV could make, checking out options and comparing vehicles is a great way to begin.
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FAQs
Yes. Electric vehicles produce zero tailpipe emissions, meaning no CO₂ is released while driving. Although EV batteries require energy to manufacture, studies show that EVs typically produce significantly lower lifecycle CO₂ emissions than petrol or diesel cars, especially as the UK electricity grid becomes greener.
A typical petrol car in the UK emits around 4.6 tonnes of CO₂ per year, depending on mileage and fuel efficiency. Drivers covering about 10,000 miles annually can produce over 2 tonnes of CO₂, which adds up quickly over the lifetime of the vehicle.
Official emissions are measured using the WLTP testing standard, which takes place under controlled laboratory conditions. Real-world driving often produces higher emissions due to factors such as traffic, cold starts, short journeys, aggressive acceleration, and heavy loads.
Based on driver data, switching to an EV can reduce emissions by around 1.27 tonnes of CO₂ per year, or 4.04 tonnes over a typical three-year lease period. The exact savings depend on mileage, charging habits, and the type of petrol or diesel vehicle being replaced.