Vehicle charging guide · UK

How much does it cost to charge a MG4 EV?

Battery sizes, realistic efficiency, full-charge prices, cost per mile and charging times for the common UK MG4 versions.

The MG4 EV covers everything from an efficient standard-range hatchback to the four-wheel-drive XPower. Battery size and efficiency therefore make a meaningful difference to both the bill and the time spent charging. This guide turns those differences into practical UK charging costs and times, using consistent assumptions so that trims can be compared fairly.

Electricity prices change. The rates below are illustrative and were current for this guide on 14 September 2026: 24.67p/kWh for a price-cap home unit rate, 8.8p/kWh for a typical overnight EV tariff, 63p/kWh for public rapid charging and 79p/kWh for public ultra-rapid charging. They are not a quote. Check your supplier or chargepoint app before relying on them.

MG4 EV battery size and real-world efficiency

Usable capacity is the energy the driver can normally access, not necessarily the larger gross capacity printed in technical material. Efficiency is expressed in miles per kWh: a higher number means the car travels farther on the same electricity. The figures below are sensible mixed-driving planning values, not promises from a laboratory test.

Motorway speeds, winter temperatures, wet roads, roof boxes and cabin heating reduce efficiency. Gentle urban driving in mild weather can improve it. A realistic annual budget should use the lower end of what the driver regularly sees rather than the best trip-computer result. Battery age can also reduce accessible energy, particularly on an older used example.

Full-charge cost and cost per mile

Every full-charge figure includes a 10% charging-loss allowance. The calculation divides usable battery capacity by 0.90 to estimate energy drawn from the charger, then multiplies it by the unit rate. Cost per mile similarly divides the rate by efficiency and 0.90. Actual DC losses may differ from AC losses, but one assumption keeps this comparison clear and avoids pretending every paid kWh reaches the battery.

A full charge is a useful comparison, but most owners rarely arrive at zero and charge straight to 100%. A routine 20–80% top-up adds 60% of the amounts shown. Home off-peak charging is dramatically cheaper because the energy itself costs less; a faster charger does not inherently add more energy, although public operators price access, hardware and convenience into their tariff.

Public charging can also include membership pricing, an idle fee, a connection charge or parking. Conversely, some owners charge from surplus solar generation, but the electricity still has an opportunity value because it might otherwise be exported. For an honest ownership budget, use the blended rate across the places the car is genuinely charged.

How long the MG4 EV takes to charge

Simple AC time is usable capacity divided by charger power. These table values describe an empty-to-full theoretical session and do not add losses, balancing or tapering, so allow extra time in practice. The car, not the chargepoint, sets the ceiling: plugging into 22kW AC does not mean every version accepts 22kW. Many UK cars take 11kW or 7kW AC, making the real 22kW-column time longer than the mathematical best case.

The 144kW figure is a peak, not an average. DC speed rises and falls along a charging curve, and the car normally slows sharply as it approaches full. The quoted about 26 minutes 10–80% time is therefore more useful for a road-trip stop than dividing battery size by peak power. It assumes a capable working charger and a conditioned battery in a suitable temperature range.

A 7kW home wallbox is generally enough to replace a normal day’s driving overnight. Three-pin charging is substantially slower and should use a suitable, professionally checked socket. At public sites, sharing power, charger faults or a battery that is very cold or hot can extend the stop. Route planning should include a buffer instead of treating a brochure time as a deadline.

Choosing the right rate for an estimate

Use the home price-cap row only if the household unit rate is close to it; standing charges are excluded because the household pays them regardless of an individual charging session. The off-peak row assumes the complete session fits inside the cheaper window. If charging continues into the daytime period, split the energy between both rates.

Use rapid pricing for ordinary high-power public units and ultra-rapid pricing for the fastest hubs, but check the network’s own definition and live price. Charger labels describe maximum power, while tariffs describe the price charged. A MG4 EV connected to a 350kW post still cannot exceed the car’s own DC limit, yet the operator may charge its ultra-rapid tariff.

Frequently asked questions

What these numbers do and do not include

The tables are planning estimates for common UK trims, not vehicle-specific quotations. They include a consistent charging-loss assumption but exclude standing charges, subscriptions, parking, idle fees and battery degradation. Specifications can change during a model year, and a registration document or vehicle display may not identify every hardware revision. Confirm the battery and charging specification of the exact car.

Costs also change immediately when the electricity rate changes. Recalculate with the site’s main calculator using the tariff shown on the latest bill or charging app. That produces a more useful answer than preserving a dated national average. For journey planning, combine the cost estimate with the road trip calculator and leave enough reserve to reach an alternative charger.