When browsing the latest electric car reviews in the UK, two names consistently dominate the affordable hatchback segment: the MG4 EV and the BYD Dolphin. As the automotive industry shifts away from internal combustion engines, British drivers are increasingly looking for zero-emission vehicles that do not compromise on practicality, style, or affordability. Both MG and BYD have stepped up to the plate, offering compelling alternatives to legacy European automakers.
In this comprehensive head-to-head comparison, we dissect every aspect of these two market leaders. Whether you are a company car driver looking to minimize Benefit-in-Kind (BiK) tax liabilities, or a private buyer seeking a reliable daily commuter, this guide will help you decide which EV deserves a spot on your driveway. For a broader look at the market, be sure to check out our roundup of the best electric cars in the UK.
Vehicle Overview
The MG4 EV represents a massive leap forward for SAIC Motor's historic British brand. Built on a dedicated electric vehicle platform, the MG4 was engineered from the ground up to be a rear-wheel-drive, dynamic hatchback. It has garnered widespread acclaim for its engaging driving dynamics, aggressive styling, and competitive pricing. You can read our full, in-depth MG4 EV full review for more on its development.
The BYD Dolphin, on the other hand, hails from the Chinese manufacturing giant Build Your Dreams. Utilizing BYD's highly regarded e-Platform 3.0 and featuring their proprietary Blade Battery technology, the Dolphin prioritizes safety, interior space, and cutting-edge infotainment. It approaches the hatchback formula with a more comfort-oriented, front-wheel-drive layout. Dive deeper into its quirks and triumphs in our BYD Dolphin full review.
Side-by-Side Specification Comparison
Before we delve into the nuanced driving experiences and ownership costs, let us look at the raw data. The table below compares the most popular mid-spec, long-range variants of both vehicles.
| Specification | MG4 EV (64kWh SE) | BYD Dolphin (60.4kWh Design) |
|---|---|---|
| Battery Chemistry | NMC (Nickel Manganese Cobalt) | LFP (Lithium Iron Phosphate Blade) |
| Usable Battery Capacity | 64 kWh | 60.4 kWh |
| Drivetrain | Rear-Wheel Drive (RWD) | Front-Wheel Drive (FWD) |
| Power Output | 201 bhp (150 kW) | 201 bhp (150 kW) |
| 0-62 mph Time | 7.9 seconds | 7.0 seconds |
| WLTP Official Range | 281 miles | 265 miles |
| Max DC Charging Speed | 135 kW | 88 kW |
| Boot Capacity | 363 Litres | 345 Litres |
| Vehicle-to-Load (V2L) | Optional / Trim Dependent | Standard |
Range & Efficiency
Range anxiety remains a primary concern for EV adopters, making this category crucial in any electric car comparison. The MG4 EV utilizes a traditional NMC (Nickel Manganese Cobalt) battery pack. NMC batteries offer higher energy density, which translates to the MG4's superior official WLTP rating of 281 miles for the 64kWh model. For broader context, when evaluated against EPA rating methodologies, which tend to be more conservative and reflective of high-speed highway driving, the MG4 still maintains a highly respectable efficiency profile.
The BYD Dolphin employs a 60.4 kWh LFP (Lithium Iron Phosphate) Blade Battery. While LFP chemistry is slightly heavier and less energy-dense—resulting in a lower WLTP figure of 265 miles—it offers significant longevity and safety benefits. LFP batteries can be routinely charged to 100% without degrading the battery health, whereas NMC batteries are generally recommended to be charged to 80% for daily use. Therefore, the usable daily range between the two cars is remarkably similar in real-world scenarios.
In independent winter testing, the Dolphin's LFP battery showed slightly more resistance to cold-weather range degradation compared to the MG4, though both vehicles benefit from standard heat pumps to maximize cabin efficiency. For more tips on maximizing your miles, consult our comprehensive EV charging and efficiency guide.
Price & Value Proposition
Both the MG4 and the Dolphin have disrupted the UK market by offering premium features at budget-friendly price points. The MG4 is available in a variety of trims, starting from a highly affordable base model and scaling up to the Trophy and XPOWER variants. The mid-range SE trim offers the best balance of cost and equipment, featuring 17-inch alloy wheels, adaptive cruise control, and a 360-degree camera.
BYD takes a slightly different approach with the Dolphin, offering fewer trim levels but packing an immense amount of standard equipment into each one. The Design trim includes a panoramic glass roof, heated front seats, and a premium audio system as standard. When comparing like-for-like trims, the Dolphin often undercuts the MG4 by a narrow margin, making it a favorite among those browsing the best budget EVs.
For UK company car drivers, both vehicles are incredibly attractive due to their zero tailpipe emissions, placing them in the lowest Benefit-in-Kind (BiK) tax brackets. The slight price advantage of the Dolphin can mean a marginal saving in monthly lease costs, but the MG4's higher residual values often balance the scales over a three-year contract.
Charging Speed & Infrastructure
When it comes to topping up on the UK's public charging network, the MG4 EV holds a distinct advantage. Capable of accepting up to 135 kW of DC rapid charging power, the MG4 can replenish its battery from 10% to 80% in approximately 35 minutes. This makes it a more viable option for drivers who frequently embark on long motorway journeys.
The BYD Dolphin, conversely, is limited to a peak DC charging rate of 88 kW. While this is perfectly adequate for urban commuting and overnight home charging, a 10% to 80% top-up on a rapid charger takes closer to 45 minutes. However, BYD excels in AC charging capabilities, offering an 11 kW onboard charger as standard across the range, ensuring that home wallbox charging is swift and efficient.
A major highlight for the Dolphin is the standard inclusion of Vehicle-to-Load (V2L) technology. This allows you to plug standard household appliances directly into the car, turning the Dolphin into a mobile power bank—perfect for camping trips or powering tools. The MG4 offers V2L, but it is often restricted to higher trims or requires an optional adapter.
Performance & Driving Dynamics
This is where the two vehicles diverge most significantly in character. The MG4 EV is built on a dedicated rear-wheel-drive architecture with a multi-link rear suspension setup. This configuration is a rarity in the affordable hatchback segment and pays massive dividends on twisting B-roads. The steering is communicative, the chassis is beautifully balanced, and the 201 bhp electric motor delivers a playful, engaging driving experience that enthusiasts will adore.
The BYD Dolphin utilizes a more conventional front-wheel-drive layout with a torsion beam rear axle. While it matches the MG4's 201 bhp output and actually beats it in a straight-line sprint to 62 mph (7.0 seconds vs 7.9 seconds), the Dolphin is not a sports hatchback. The suspension is tuned strictly for comfort, absorbing urban potholes and speed bumps with ease, but it can feel slightly floaty on undulating country roads. Furthermore, the front tires can struggle for traction when applying full torque from a standstill in wet UK weather.
If you prioritize driving engagement and handling, the MG4 is the undisputed winner. If you prefer a soft, compliant ride for city commuting, the Dolphin takes the crown.
Interior Space & Practicality
Stepping inside the cabin, both cars offer ample space for four adults, but their design philosophies differ. The MG4 features a minimalist, driver-focused cockpit. The materials are a mix of soft-touch plastics and harder, more durable surfaces. The boot offers a practical 363 litres of space, which expands significantly with the rear seats folded flat. However, the rear seating bench is slightly low, which can leave taller passengers wishing for more under-thigh support.
The BYD Dolphin feels noticeably more premium upon first entry. BYD has utilized high-quality vegan leather and soft-touch materials extensively across the dashboard and door cards. The interior is airy, aided by the large panoramic roof on higher trims. Rear legroom is generous, and the seating position is more upright and comfortable for long journeys. The boot space is slightly smaller at 345 litres, and the load lip is a bit higher, making loading heavy groceries slightly more cumbersome than in the MG4.
Technology & Infotainment
The centerpiece of the BYD Dolphin's interior is its signature 12.8-inch rotating infotainment screen. With a tap of a button, the screen transitions from landscape to portrait mode, mimicking a giant smartphone. The software is visually impressive and feature-rich, though it can occasionally suffer from slight input lag, and the menu structure requires a learning curve. The Dolphin also features a highly digital instrument cluster and a futuristic, rotary gear selector.
The MG4 utilizes a dual-screen setup with a 10.25-inch central touchscreen and a 7-inch digital driver display. While the graphics are not quite as vibrant as the BYD's, the MG's software is generally more intuitive and responsive. Crucially, the MG4 retains physical shortcut buttons for climate control and volume, a massive ergonomic advantage over the Dolphin, which buries many of these functions within touchscreen submenus. Both cars support Apple CarPlay and Android Auto, ensuring seamless smartphone integration.
Regarding Advanced Driver Assistance Systems (ADAS), both cars come equipped with comprehensive safety suites. However, independent reviews frequently note that the MG4's lane-keep assist can be overly intrusive, though recent software updates have improved its calibration. The BYD's DiPilot system is slightly smoother but can be overly sensitive to speed limit sign recognition.
Warranty & Aftercare
Peace of mind is critical when adopting new automotive technology, and both manufacturers offer robust guarantees to assuage buyer concerns. The MG4 comes with a comprehensive 7-year / 80,000-mile warranty, which covers the vehicle and the high-voltage battery. MG's dealer network in the UK is vast and well-established, making servicing and warranty claims relatively straightforward.
BYD also offers a 7-year warranty, but with a slightly more generous 100,000-mile limit. The battery is covered for 8 years or 100,000 miles. While BYD's dealer network is expanding rapidly across the UK, it is not yet as ubiquitous as MG's, which is something rural buyers should consider when evaluating local aftercare support.
The Verdict: Which EV Should You Buy?
Choosing between the MG4 EV and the BYD Dolphin ultimately comes down to your personal priorities as a driver.
Choose the MG4 EV if: You are an enthusiastic driver who values rear-wheel-drive dynamics, sharper handling, and faster DC rapid charging speeds. It is the better all-rounder for those who frequently drive on motorways and enjoy a sportier driving experience.
Choose the BYD Dolphin if: You prioritize interior material quality, a comfortable urban ride, and cutting-edge infotainment. The inclusion of standard V2L technology and the longevity of the LFP Blade battery make it an exceptional choice for city dwellers and tech-savvy commuters.
Both vehicles represent the pinnacle of the current affordable EV market, proving that you do not need to spend a fortune to secure a highly capable, zero-emission vehicle.
Frequently Asked Questions
Which EV has the better real-world range?
In optimal summer conditions, the MG4 EV's larger 64kWh NMC battery and superior aerodynamics allow it to edge out the Dolphin, achieving closer to its 281-mile WLTP claim. However, the BYD Dolphin's LFP battery is less susceptible to severe cold-weather degradation. Furthermore, because LFP batteries can be safely charged to 100% daily without long-term health penalties, the Dolphin's usable daily range often matches or exceeds the MG4's recommended 80% daily charge limit.
Are the MG4 and BYD Dolphin eligible for UK EV grants?
The UK's Plug-in Car Grant (PiCG) for private buyers has ended, meaning neither car qualifies for a direct upfront discount from the government. However, both vehicles remain highly eligible for various localized schemes, workplace charging grants, and the incredibly favorable Benefit-in-Kind (BiK) company car tax rates. Additionally, private buyers can still utilize government-backed grants for installing home wallbox chargers, provided they meet the specific criteria for off-street parking.
How do the infotainment systems compare for smartphone integration?
Both the MG4 and the BYD Dolphin support wireless Apple CarPlay and Android Auto, which is a massive plus for UK drivers who rely on navigation apps like Waze or Google Maps. The MG4's landscape-oriented screen integrates these smartphone mirroring systems seamlessly, utilizing the full width of the display. The BYD Dolphin's rotating screen is a neat party trick, but when switched to portrait mode for smartphone mirroring, it can sometimes result in awkward letterboxing or stretched interfaces depending on the specific app being used.
