The profound economic shockwaves of escalating geopolitical conflicts are continuing to hit motorists across the United Kingdom, where a severe surge in fossil-fuel prices has widened the running cost gap between internal combustion engine vehicles and electric alternatives to unprecedented levels. According to a comprehensive new analysis conducted by Carbon Brief utilizing government and industry data, it is now up to nine times cheaper to drive an electric vehicle (EV) in the UK than it is to operate a traditional petrol or diesel car.
The dramatic divergence in motoring costs has been precipitated by a sustained upward trajectory in global oil prices, which have climbed past $100 per barrel. This sharp escalation has been driven primarily by intensifying geopolitical tensions and conflicts in the Middle East, including escalating hostilities between Yemen’s Houthis and Saudi Arabia, alongside ongoing military engagements following initial strikes involving Iran earlier in the year. Consequently, crude oil prices have surged by roughly 50% since June, sending ripples through international energy markets and translating directly into painful spikes at filling stations across Britain.
Government figures analyzed by Carbon Brief reveal that the average price of diesel has jumped by 38% since February, reaching £1.96 a litre. Furthermore, market analysts warn that prices are expected to pass the historic milestone of £2 a litre following a strategic attack on the Kapotnya oil refinery in Russia on September 20, combined with the compounding pressures of growing Middle Eastern instability. Historically the second-largest exporter of diesel in the world, Russia has seen its refining capacity severely hampered by ongoing drone strikes, which have hit its top-producing refineries with an average frequency of once every three days during the first half of the year.
Petrol prices have followed a similarly aggressive upward path. Government statistics show a 31% surge in petrol prices since February, bringing the average cost to £1.72 a litre, with numerous locations across the country already approaching the £2-per-litre threshold, according to reports from BBC News.
These sustained fuel price hikes have dramatically inflated the per-mile cost of operating fossil-fuel vehicles. Carbon Brief’s analysis of the latest weekly road fuel prices from the Department of Energy Security and Net Zero (DESNZ) indicates that it now costs an estimated 21p per mile to drive a typical diesel car, while petrol car owners face costs of approximately 20.1p per mile.
In stark contrast, the cost of powering an electric vehicle remains remarkably insulated for motorists who utilize smart home charging solutions. For drivers charging their vehicles using an off-peak domestic energy tariff, the cost plummets to a mere 2.3p per mile—making electric driving up to nine times cheaper than operating a diesel equivalent.
Even for consumers who do not possess specialized off-peak tariffs and instead charge their vehicles using electricity purchased at the standard domestic price cap, the savings remain substantial. The price cap, which is regulated and adjusted every three months by Ofgem to set the maximum unit rate and standing charge a supplier can levy, currently puts the cost of driving an EV at around 7p per mile. This makes electric motoring roughly three times cheaper than driving a conventional petrol or diesel vehicle.
Looking ahead, the regulatory energy landscape presents manageable adjustments for EV owners. While Ofgem’s upcoming price cap adjustment in October will see slight increases, nearly the entirety of that rise is attributable to escalating gas costs, with the unit rate for electricity expected to rise by less than 1%—moving from 26.1p per unit to 26.3p. A more substantial adjustment is anticipated in January 2027, when higher wholesale gas costs are projected to filter through, potentially driving a 20% increase in electricity unit rates under the price cap. Nevertheless, analysts emphasize that even with these anticipated shifts, EVs will maintain a massive cost-per-mile advantage over petrol and diesel vehicles.
To put these figures into a tangible perspective for British motorists, the average driver can expect to save roughly £80 every time they charge an EV at home compared to the cost of filling a standard family petrol car to cover the exact same distance. When evaluating equivalent fuel volumes, filling a typical 55-litre petrol tank costs nearly £100 at current pump prices, whereas the electrical energy required to travel an identical distance via off-peak home charging costs a fraction of that amount.
Translating these savings to an annual scale, previous research published by Carbon Brief in June suggested that UK EV drivers were already saving an average of £1,100 a year in fuel costs compared to their petrol-driving counterparts. Following the most recent spikes at the pump, those annual savings have expanded further, reaching an estimated £1,200 per driver.
When measured against average pump prices of £1.72 per litre for petrol and £1.96 per litre for diesel, utilizing off-peak electricity yields an energy equivalent costing as little as 20p per litre—roughly nine times cheaper than petrol. Even when charging entirely at the standard household price cap, the equivalent cost sits at around 60p per litre, preserving a profound economic incentive for electrification.
Despite the compelling financial advantages of lower running costs, traditional internal combustion engines continue to dominate the physical landscape of the UK’s roadways. Petrol-powered vehicles currently account for approximately 55% of all cars on British roads. Fully electric battery vehicles represent only about 6% of the roughly 35 million cars in active circulation, with plug-in hybrids comprising an additional 3%.
However, consumer adoption patterns demonstrate a clear momentum toward electrification. Registration data from the Society of Motor Manufacturers and Traders (SMMT) indicates that battery electric vehicles accounted for approximately 30% of all new car sales in August, marking a notable increase from the 26.5% recorded in August of the previous year.
While public charging networks continue to command significantly higher tariffs than domestic electricity supplies, government data underscores that the vast majority of EV charging occurs within the residential sphere. Official estimates suggest that approximately 76% of all EV charging sessions take place at home, facilitated by the fact that roughly 90% of electric car owners maintain access to domestic off-street parking and charging facilities.
As the automotive market transitions, fiscal policy is also evolving to address changes in vehicle taxation. The UK government has confirmed plans to introduce a new pay-per-mile vehicle excise duty specifically for electric vehicles, slated to take effect from April 2028. This upcoming policy framework is projected to add approximately 3p per mile to the operational cost of driving an EV. However, even with the addition of this future road tax, the substantially lower baseline cost of electrical energy ensures that electric vehicles will retain a formidable economic advantage over petrol and diesel cars for the foreseeable future.
