Published November 2026.
“Hybrid” covers three very different kinds of car. A mild hybrid is essentially a petrol or diesel car with a small electric boost. A full hybrid, often sold as a “self-charging hybrid”, can drive short distances on electric power alone. A plug-in hybrid has a much bigger battery you charge from the mains and can do most short journeys without using fuel. Here’s how they differ, what they really cost to run, and which suits the way you drive.
Mild vs full vs plug-in hybrid at a glance
| Mild hybrid (MHEV) | Full hybrid (HEV) | Plug-in hybrid (PHEV) | |
|---|---|---|---|
| Drives on electric alone? | No | Yes, short distances at low speed | Yes, typically 25 to 60+ miles |
| How it charges | Braking and the engine | Braking and the engine | Plugged in, plus braking and the engine |
| Battery | Small, often 48-volt | Small to medium | Large |
| Fuel saving | Small | Good, especially in town | Large if charged regularly; small if not |
| Price | Close to the petrol version | Higher | Highest |
| New sales allowed until | 2030 | 2035 | 2035 |
Mild hybrid: a small electric helper
A mild hybrid has a small battery, usually 48-volt, and a starter-generator that recovers energy when you slow down. It uses that energy to help the engine pull away, smooth the stop-start system and power the electrics. It can’t drive the car on electric power alone, so it behaves exactly like a normal petrol or diesel car, with slightly better economy.
Good for: anyone who wants a conventional car with a small efficiency gain and no change to how they drive.
Full hybrid (self-charging hybrid)
A full hybrid has a bigger battery and an electric motor powerful enough to move the car on its own. At low speeds, in traffic and when you pull away, it often runs on electric power, with the engine starting up as needed. The battery charges as you brake and from the engine. “Self-charging” is a marketing term: you can’t plug it in, and all its energy ultimately comes from fuel.
Good for: town and suburban driving, stop-start traffic, and drivers who can’t charge at home.
Plug-in hybrid (PHEV)
A plug-in hybrid has a much larger battery that you charge from a home charger or public point, giving an electric range of roughly 25 to 60 miles in most models, and more in some newer ones. On short trips with a charged battery, it can run without using any fuel. Once the battery is flat, it works like a heavy full hybrid.
The catch is that the savings depend entirely on charging. A February 2026 study of around a million European plug-in hybrids by Fraunhofer ISI, the Öko-Institut and ifeu found their real-world CO2 emissions, and so their fuel use, were three to five times the official figures, largely because many are rarely plugged in, particularly company cars. Charged every day, a plug-in can be very cheap to run; never charged, it can use more fuel than a normal hybrid.
Good for: drivers with home charging whose daily journeys fit within the electric range, but who also do long trips.
Which hybrid is best for you?
| Your driving | Best fit |
|---|---|
| Mostly short trips, and you can charge at home | Plug-in hybrid, or consider a fully electric car |
| Town and suburban driving, no home charging | Full hybrid |
| Mostly motorway miles | Mild hybrid or an efficient petrol or diesel; hybrids save least at steady speed |
| Low mileage and a tight budget | Mild hybrid or full hybrid |
If you can charge at home and rarely drive long distances, a fully electric car may cost less to run than any hybrid. Our guide to whether now is a good time to buy an electric car compares the costs.
Car tax and running costs
- Car tax: hybrids pay the same as petrol cars. For cars registered since April 2017, the first year’s rate depends on CO2 emissions, then the standard rate is £200 a year from April 2026, plus £440 a year for five years on cars with a list price over £40,000. See GOV.UK’s rate tables.
- Pay-per-mile from 2028: the Autumn Budget 2026 confirmed that from April 2028 plug-in hybrids will pay 1.5p a mile on top of car tax, and electric cars 3p. Mild and full hybrids won’t. Our Budget 2026 guide for drivers has the details.
- No grant: the Electric Car Grant is only for fully electric cars, not hybrids.
- Clean air zones: petrol hybrids normally meet ULEZ and Clean Air Zone standards, as most petrol cars from 2006 on do. See our ULEZ and clean air zones guide.
Our free MPG check shows a car’s official fuel economy and estimated annual fuel cost, and our car tax check shows what it costs to tax.
What happens to hybrids in 2030 and 2035?
Under the government’s rules confirmed in April 2025, new pure petrol and diesel cars can’t be sold from 2030, and that includes mild hybrids, because they rely on the engine to drive the car. Full hybrids and plug-in hybrids can be sold new until 2035, after which new cars must be zero emission. None of this affects cars already on the road: you can keep driving, buying and selling used hybrids of every type.
Buying a used hybrid: what to check
- Know which type it is. Adverts often say just “hybrid”. Our electric vehicle check identifies plug-in hybrids and shows their electric range, charging times and battery warranty; our free MPG check shows the fuel type and official economy of any hybrid.
- Battery warranty and health. Hybrid batteries often have a longer warranty than the rest of the car, and some makers extend it if the car is serviced at their dealers. Ask for a battery health check on an older car.
- Service history. Hybrids still need regular engine servicing.
- For a plug-in, check the charging cable is included and test the electric range against the official figure.
- The car’s history. A full car history check shows whether it has been written off, stolen or has finance owing. See Silver and Gold check prices.
Our guide to buying a used electric car covers battery checks in more detail.
Frequently asked questions
Is a mild hybrid a real hybrid?
It’s a hybrid, but it can’t drive on electric power alone. It works like a normal petrol or diesel car with a small electric boost, and it’s treated as petrol or diesel under the 2030 rules.
What is a self-charging hybrid?
A full hybrid. It charges its battery from the engine and braking, and can’t be plugged in. It can drive short distances on electric power alone.
Is a plug-in hybrid better than a hybrid?
Only if you charge it regularly. Charged daily, a plug-in hybrid can do most short trips without fuel; rarely charged, a full hybrid is usually more economical.
Do hybrid cars pay road tax?
Yes. Hybrids pay the same car tax as petrol cars, and from April 2028 plug-in hybrids will also pay 1.5p a mile.
Can I still buy a hybrid after 2030?
New full and plug-in hybrids can be sold until 2035, new mild hybrids only until 2030. Used hybrids can be bought and sold after both dates.
- GOV.UK: vehicle tax rate tables
- RAC: hybrids allowed until 2035 under the revised phase-out (April 2025)
- Öko-Institut, Fraunhofer ISI and ifeu: plug-in hybrids in real-world driving (February 2026)
- Autumn Budget 2026: what it means for drivers
- Electric car tax: what you need to know
- The ultimate guide to buying a used electric car
Check a plug-in hybrid’s electric range, charging times and battery warranty with our free electric vehicle check.
