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Mercedes B Class vs MG MG3 comparison

Compare performance (238 HP vs 194 HP), boot space and price (33,100 £ vs 15,400 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or MG MG3?

Mercedes B Class vs MG MG3: Key differences

Mercedes B Class

4.9 (6 Reviews)
rate
  • moderately more power
  • noticeably quicker 0–100 km/h
  • visibly more trunk space
details

MG MG3

5 (1 Reviews)
rate
  • clearly cheaper
  • moderately more efficient
  • a bit lighter
details

All details on performance, efficiency, range and trunk space can be found in the technical comparison below – including user reviews for both models.

By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

B Class

Costs and Efficiency:

Price and efficiency are key factors when choosing a car – and this is often where the real differences emerge.

MG MG3 is clearly cheaper – starting at 15,400 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 17,709 £.

Fuel consumption also shows a difference: the MG MG3 uses 4.4 L/100km and is moderately more efficient than the Mercedes B Class with 5.1 L/100km. The difference is about 0.7 L/100km.

MG3

Engine and Performance:

Power, torque and acceleration are the classic benchmarks for car enthusiasts – and here, some clear differences start to show.

When it comes to engine power, the Mercedes B Class offers moderately more power – delivering 238 HP compared to 194 HP. That’s roughly 44 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes B Class is noticeably quicker – completing the sprint in 6.5 s, while the MG MG3 takes 8 s. That’s about 1.5 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers significantly more torque with 400 Nm compared to 148 Nm. That’s about 252 Nm more.

B Class

Space and Everyday Use:

Cabin size, boot volume and payload all play a role in everyday practicality. Here, comfort and flexibility make the difference.

Both vehicles offer seating for 5 people.

In terms of curb weight, MG MG3 is a bit lighter – 1,237 kg compared to 1,405 kg. The difference is around 168 kg.

Looking at boot space, the Mercedes B Class offers visibly more boot space – 455 L compared to 293 L. That’s a difference of about 162 L.

When it comes to payload, the Mercedes B Class carries slightly more – 550 kg compared to 448 kg. That’s a difference of about 102 kg.

Who wins the race in the data check?

The Mercedes B Class is slightly ahead in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £33,100
B Class

Mercedes B Class

  • Engine Type Petrol MHEV, Diesel
  • Transmission Automatic
  • Drive Type Front-Wheel Drive, All-Wheel Drive
  • Power HP 116 - 238 HP
  • Consumption L/100km 5.1 - 6.9 L/100km
details

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Mercedes B Class
MG MG3

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mercedes B Class

The Mercedes B-Class is a smart, grown-up compact people carrier that dresses everyday practicality in a near‑premium polish, perfect for buyers who want comfort and a classy badge without the theatrics. It won’t set your pulse racing on a back road, but it will make school runs, commutes and grocery hauls feel pleasantly civilized — a reliable, slightly posh companion for real life.

details
18C0947_011
18C0947_009
18C0953_005
18C0953_035
18C0947_044

Reviews Mercedes B Class

4.9 (6 Reviews)
rate
SiBa
31 Jul 2026, 14:51:34

We've been driving only the B180D automatic for 9 years — there's nothing better. Great on long trips; the next one will be another B180D automatic.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Safety
Practicality / Trunk & Everyday Use
Value for Money
Peter
5 Mar 2026, 05:51:19

My wife and I have been driving a Mercedes W247 200d for seven years now, with 93,000 km on the clock. The car is very comfortable even on long trips and economical. At the last service the pads of the electric parking brake were replaced; otherwise no repairs. We love this car.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

MG MG3

The MG3 is a cheeky city hatch that pairs bold, youthful styling with sprightly handling for drivers who want personality on a budget. Its cabin is bright and cleverly packaged, offering sensible space and a fun-to-drive character that turns mundane commutes into something a bit more enjoyable.

details
KV-1-1
Left-Back-30°-1
Front-Row-Space-1
Trunk-3

Reviews MG MG3

5 (1 Reviews)
rate
Giorgio catacchio
20 Sept 2025, 00:08:28

I've owned the MG3 Hybrid for a year — I travel a lot, never a dull moment; comes fully loaded as standard, incredible acceleration, etc.

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Mercedes B Class
MG MG3

Costs and Consumption
Price
33,100 - 52,500 £
Price
15,400 - 21,400 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
4.4 - 6.1 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
100 - 137 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
Hatchback
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
1,237 - 1,285 kg
Trunk capacity
445 - 455 L
Trunk capacity
293 L
Length
-
Length
-
Width
1,796 mm
Width
1,797 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
373 - 448 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Petrol, Full Hybrid
Transmission
Automatic
Transmission
Manuel, Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Manual Gearbox, Automatic Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive
Power HP
116 - 238 HP
Power HP
116 - 194 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
8 - 10.8 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
148 Nm
Number of Cylinders
4
Number of Cylinders
4
Power kW
85 - 175 kW
Power kW
85 - 143 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
1,490 - 1,495 cm3

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
E, C
Brand
Mercedes-Benz
Brand
MG
What drivetrain options does the Mercedes B Class have?

Available configurations include Front-Wheel Drive or All-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.