06/01/2001
The age-old question for motorists in the UK is whether making the switch to an electric vehicle (EV) will genuinely save them money compared to their trusty petrol or diesel counterparts. While the initial purchase price of EVs has historically been a barrier for some, the conversation around running costs is where the real savings potential lies. This article delves into the nitty-gritty of comparing the cost of running an electric car with traditional internal combustion engine (ICE) vehicles, exploring fuel prices, journey expenses, and the factors that influence these figures. We'll also introduce a handy tool to help you make an informed decision.
Understanding Fuel Price Dynamics in the UK
The price of petrol and diesel at the pumps is a topic of national fascination in the UK, often discussed with the same fervour as the weather. While most drivers have an intuitive sense of what constitutes expensive or cheap fuel, the underlying reasons for price fluctuations and the intricate calculation of these costs are less widely understood. Several key elements contribute to the final price you pay:
The Anatomy of Fuel Pricing
Similar to most consumer goods, the price of fuel is determined by three primary components:
- Incurred Costs: These are the expenses faced by companies involved in the extraction, refining, transportation, and distribution of fuel.
- Profit Margins: Fuel companies, like any business, factor in a profit margin to ensure their operations are sustainable and profitable.
- Government Taxation: This is perhaps the most significant factor differentiating fuel prices from many other products. In the UK, taxes constitute a substantial portion of the final price at the pump.
Specifically, UK fuel prices are heavily influenced by:
- Fuel Duty: A fixed excise duty levied on every litre of fuel, currently set at 52.95 pence per litre.
- Value Added Tax (VAT): A standard rate of 20% applied to the total price, including the fuel duty.
When combined, these taxes can account for approximately 65% of the price you pay at the forecourt. Beyond these government levies, the wholesale price of crude oil, global exchange rates, and transportation costs also play a crucial role. Fuel companies will also consider their desired profit margins when setting their prices.
Why Do Diesel and Petrol Prices Differ?
You might have observed that diesel prices often differ from petrol prices, and these variations can be attributed to a few factors:
- Crude Oil Composition: Crude oil is refined into various products, including petrol and diesel. The refining process and the demand for each product can influence their respective prices.
- Taxation: Historically, diesel has sometimes faced different tax regimes compared to petrol, although this landscape is evolving.
- Market Demand: The demand for diesel, particularly from the commercial and HGV sectors, can also impact its price.
Geographical Price Variations: Why the Difference?
A common observation among UK motorists is the significant price disparity in fuel costs across different locations. Motorway service stations are frequently cited as being more expensive than supermarket forecourts. Similarly, rural petrol stations, especially those located far from major transport routes, can be pricier than those in larger towns and cities.
Several reasons explain these geographical price differences:
- Operating Costs: Stations in high-rent areas or with higher overheads (like motorway services) may need to charge more to cover their expenses.
- Competition: Areas with a higher density of fuel stations, particularly those operated by supermarkets with their own fuel infrastructure, often experience more competitive pricing.
- Logistics and Convenience: The convenience factor of a prime location, such as a motorway, can command a premium. Conversely, remote locations might have higher delivery costs, contributing to increased prices.
Calculating the Cost of Running an Electric Car
To truly understand if EVs are cheaper, we need to look at the cost per mile for electricity versus petrol or diesel. This is where a Journey Cost Calculator becomes invaluable.
How the Journey Cost Calculator Works
Our Journey Cost Calculator is designed to provide a clear comparison of running costs. Here's how you can use it:
- Select Your Vehicles: Choose an electric car from our extensive list of new or used plug-in vehicles. Then, select a petrol or diesel car that you would typically use for comparison.
- Input Your Journey Details: Enter the typical distance of your journeys and how frequently you undertake them.
- Provide Your Energy Costs: Input your home electricity costs (per kWh) and the current average petrol or diesel costs. We provide default electricity costs that are updated monthly based on the current electricity price cap, and average fuel prices sourced from the RAC.
Once you've entered this information, the calculator will provide a detailed breakdown of your potential savings. It will show you how much you could save on the total journey fuel cost by choosing electric over petrol or diesel. The benefits will be presented in terms of cost per mile and estimated annual savings based on your inputted journey patterns.
Comparing Running Costs: A Deeper Dive
The core of the cost comparison lies in the price of 'fuel' – electricity for EVs and petrol/diesel for ICE vehicles. While petrol and diesel prices are subject to global oil markets and UK taxation, electricity prices are primarily influenced by wholesale energy costs and government policies.
Electricity vs. Petrol/Diesel: A Cost Per Mile Breakdown
Let's consider a simplified example to illustrate the difference:
| Vehicle Type | Efficiency | Fuel Cost per Unit | Cost per Mile (Estimated) |
|---|---|---|---|
| Electric Car (e.g., 200 miles range, 60kWh battery) | Approx. 4 miles per kWh | 15 pence per kWh (typical home charging) | 3.75 pence per mile (60kWh / 200 miles = 0.3 kWh/mile; 0.3 kWh * 15 p/kWh = 4.5p. *Correction: 15p/kWh / 4 miles/kWh = 3.75p/mile*) |
| Petrol Car (e.g., 50 mpg) | 50 miles per gallon | £1.50 per litre (approx. 68.2 pence per litre) | 7.6 pence per mile (1 litre = 4.546 litres; £1.50 / 4.546 litres = £0.329/litre. *Correction: £1.50/litre = 150p/litre. 150p/litre / 50 mpg = 3p/mile. Let's use pence per mile for consistency.* 1 litre = 1000ml. 1 gallon = 4546ml. 50 miles per gallon = 50 miles / 4546 ml. Cost = 150p / 4546ml * 1000ml = 32.9p per 10 miles = 3.29p per mile. *Let's re-calculate using direct mpg to pence per mile.* 1 gallon = 4.546 litres. If petrol is £1.50/litre, then 1 gallon costs £1.50 * 4.546 = £6.819. If the car does 50 miles per gallon, then cost per mile = £6.819 / 50 miles = £0.136 per mile = 13.6 pence per mile. *Let's use pence per litre.* Petrol cost = 150 pence per litre. Car efficiency = 50 miles per gallon. 1 gallon = 4.546 litres. To travel 50 miles, the car uses 1 gallon, which costs 4.546 litres * 150 pence/litre = 681.9 pence. So, 50 miles costs 681.9 pence. Cost per mile = 681.9 pence / 50 miles = 13.64 pence per mile. |
| Diesel Car (e.g., 60 mpg) | 60 miles per gallon | £1.55 per litre (approx. 70.4 pence per litre) | 7.1 pence per mile (1 litre = 4.546 litres; £1.55 / 4.546 litres = £0.341/litre. *Correction: £1.55/litre = 155p/litre. 155p/litre / 60 mpg = 2.58p/mile. Let's re-calculate.* 1 gallon = 4.546 litres. If diesel is £1.55/litre, then 1 gallon costs £1.55 * 4.546 = £7.046. If the car does 60 miles per gallon, then cost per mile = £7.046 / 60 miles = £0.117 per mile = 11.7 pence per mile. *Let's use pence per litre.* Diesel cost = 155 pence per litre. Car efficiency = 60 miles per gallon. 1 gallon = 4.546 litres. To travel 60 miles, the car uses 1 gallon, which costs 4.546 litres * 155 pence/litre = 704.63 pence. So, 60 miles costs 704.63 pence. Cost per mile = 704.63 pence / 60 miles = 11.74 pence per mile. |
Note: These figures are illustrative and depend heavily on current energy prices and vehicle efficiency. The calculation for pence per mile can be complex, but the principle remains: lower pence per mile means lower running costs.
Factors Influencing EV Running Costs
- Home vs. Public Charging: Charging at home, especially during off-peak hours, is generally significantly cheaper than using public rapid chargers.
- Electricity Tariffs: Variable or time-of-use electricity tariffs can offer substantial savings for EV owners who can charge overnight.
- Driving Style and Conditions: Aggressive acceleration and braking will reduce the range and increase the energy consumption of an EV, similar to how it affects ICE vehicles.
- Vehicle Efficiency: Different EV models have varying levels of efficiency, measured in kWh per mile (or miles per kWh).
Beyond Fuel: Other Cost Considerations
While fuel is a major component of running costs, it's not the only one. It's important to consider:
- Maintenance: EVs typically have fewer moving parts than ICE cars (no oil changes, fewer brake replacements due to regenerative braking), leading to potentially lower maintenance bills.
- Insurance: Insurance premiums can vary, and some newer EV models might have higher initial insurance costs.
- Depreciation: The rate at which a car loses value can differ between EV and ICE models, influenced by battery technology advancements and market demand.
- Road Tax (VED): Currently, many EVs are exempt from Vehicle Excise Duty (VED), offering an annual saving. However, this is subject to change.
Frequently Asked Questions
Are electric cars cheaper to buy than petrol or diesel cars?
Historically, the upfront purchase price of EVs has been higher. However, government grants (like the Plug-in Car Grant, although this has been phased out for cars) and falling battery costs have narrowed this gap. The total cost of ownership, factoring in fuel and maintenance savings, can make EVs more economical over their lifespan.
How much does it cost to charge an electric car at home?
This depends on your electricity tariff. If your tariff is 15 pence per kWh, charging a 60kWh battery fully would cost 60 * 0.15 = £9.00. If the car achieves 4 miles per kWh, this £9.00 charge would give you a range of 240 miles (60 kWh * 4 miles/kWh).
Is it cheaper to charge an EV at home or at a public charging station?
Generally, charging at home, especially during off-peak hours or with a dedicated EV tariff, is significantly cheaper than using most public charging stations, particularly rapid chargers.
Why does diesel cost more than petrol sometimes?
Diesel can sometimes cost more than petrol due to a combination of factors including refining costs, market demand, and historical tax differences. The price of crude oil and its refining process for different products influences these variations.
Conclusion
The evidence increasingly points towards electric cars being significantly cheaper to run than their petrol or diesel counterparts, especially when factoring in the cost of 'fuel' per mile. While the initial purchase price can still be a consideration, the substantial savings on energy and reduced maintenance costs often make EVs the more economical choice in the long run. Utilising a tool like the Journey Cost Calculator can provide personalised insights into your potential savings, empowering you to make an informed decision about your next vehicle.
If you want to read more articles similar to EV vs Petrol/Diesel: Running Cost Showdown, you can visit the Automotive category.