A plug-in hybrid (PHEV) can appear to be an ideal transition from the petrol and diesel vehicles many drivers have relied on for decades to a fully electric car.
Designed to provide greater flexibility, PHEVs combine long-distance capability and the convenience of rapid refuelling with lower emissions and the potential running-cost benefits associated with electric driving—without the risk of being stranded by a depleted battery.
Consumer confidence in this approach appears strong. Year to date, PHEV sales have risen by 41.8 per cent, increasing market share to 13.1 per cent from 10.1 per cent in 2025.
This follows last year’s policy change by the Labour government, which extended the sale of new plug-in hybrids through to 2035.
However, key questions remain: do PHEVs genuinely deliver meaningful savings, are they more affordable than comparable EVs, and could the introduction of pay‑per‑mile road taxation reduce or remove any financial advantage?
This article examines these issues to assess whether the growth in PHEV sales is being driven by real-world cost benefits or whether the technology falls short of its promise.
A transitional option before moving fully electric
In April 2025, the Labour government announced a five-year extension to the planned 2030 ban on new petrol and diesel car sales for hybrid vehicles.
Both plug-in hybrids and self-charging hybrids may therefore continue to be sold as new vehicles until 2035.
This change formed part of a series of revisions to the Zero Emission Vehicle (ZEV) mandate, which requires manufacturers to increase the proportion of zero-emission cars and vans they sell each year in order to accelerate the shift to EVs.
For drivers who are unwilling—or not yet able—to switch to full battery-electric vehicles, this effectively provides a further decade of flexibility, with plug-in hybrid powertrains positioned as a practical interim solution.
Given that 40 per cent of drivers surveyed by Tempcover insurance reported changing their vehicle every three to five years, this extension could allow many motorists to purchase up to two additional new plug-in hybrid models before moving to a fully electric vehicle.
Pay-per-mile tax may affect plug-in hybrid demand
In January, Rachel Reeves announced plans to introduce a pay‑per‑mile road tax for electric cars from 2028.
While the scheme is primarily intended to replace declining fuel duty revenues from EV drivers, plug-in hybrid owners would also be subject to the new electric Vehicle Excise Duty (eVED) charge.
Under the proposal, fully electric cars would be charged 3p per mile, while plug-in hybrids would be charged 1.5p per mile.
However, because PHEVs also use a combustion engine—typically petrol—drivers would pay the per‑mile charge in addition to fuel duty at the pump, resulting in a dual tax burden.
Some newer PHEVs offer up to 93 miles of electric-only range, meaning owners could incur the per‑mile charge even when driving primarily on electricity. With more than one million PHEVs on UK roads, the policy could have a broad impact.
Many drivers have criticised the measure, arguing that they were encouraged to adopt plug-in hybrids on the basis of lower emissions and running costs, only to face additional taxation. Some have indicated they may switch back to petrol vehicles before 2028 to avoid these charges.
One owner, Loraine Davison (73), said that on an approximately 800‑mile trip—around 750 miles of which were driven on petrol—she would have paid fuel duty as usual and could have faced an additional £12 in charges despite using minimal electric mileage. She described this as an excessive effective cost per electric mile.
How far can PHEVs travel on electricity alone?
In recent years, electric-only ranges for plug-in hybrids have increased across most vehicle categories.
This has been driven largely by improved battery technology and greater availability of battery packs, with China playing a significant role. China produces more than 75 per cent of the world’s lithium‑ion batteries and is home to six of the ten largest battery manufacturers globally.
This has enabled Chinese manufacturers to bring new technology to market more quickly, increasing competitive pressure on European brands.
A notable example is Chery, China’s largest car exporter, which says it has developed five generations of hybrid technology over the past 26 years. Chery entered the UK in 2024 through its Omoda brand, followed by Jaecoo in early 2025, and then its own Chery-branded models in 2025.
Models using Chery’s “Super Hybrid System” pair a turbocharged petrol engine with an electric motor and rechargeable battery. The system is designed to maintain sufficient battery charge so that electric drive can be used when required, rather than allowing the battery to fully deplete.
As a result, some models offer electric-only ranges of up to 93 miles. For example, the Jaecoo 7 SHS‑P reportedly offers 56 miles of electric-only range and a combined range of 745 miles.
European brands are also introducing longer-range PHEVs. The Audi A3 TFSI is listed with an electric-only range of up to 88 miles, while the Toyota RAV4 Icon offers more than 85 miles and the Seat Leon e‑Hybrid up to 82 miles—substantially more than the 40-mile range offered by the first Leon e‑Hybrid in 2020.
In addition, some PHEVs now support DC fast charging, making it easier to use electric mode for regular commuting and to recharge quickly when needed. For example, the Audi A3 TFSI can reportedly charge at up to 50kW, replenishing from 10 to 80 per cent in around 29 minutes.
Taken together, these developments increase consumer choice and, at least in theory, should improve fuel savings—though real-world outcomes may differ.
