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Mazda 3 Sedan vs Mercedes B Class comparison

Compare performance (186 HP vs 238 HP), boot space and price (25,000 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – Mazda 3 Sedan or Mercedes B Class?

Mazda 3 Sedan vs Mercedes B Class: Key differences

Mazda 3 Sedan

4.7 (1 Reviews)
rate
  • clearly cheaper
details

Mercedes B Class

4.9 (5 Reviews)
rate
  • clearly more power
  • only slightly more efficient
  • clearly quicker 0–100 km/h
  • very slightly lighter
  • very slightly more trunk space
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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

3 Sedan

Costs and Efficiency:

Looking at overall running costs, both models reveal some interesting differences in everyday economy.

Mazda 3 Sedan is clearly cheaper – starting at 25,000 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 8,152 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is only slightly more efficient than the Mazda 3 Sedan with 5.5 L/100km. The difference is about 0.4 L/100km.

B Class

Engine and Performance:

Under the bonnet, it becomes clear which model is tuned for sportiness and which one takes the lead when you hit the accelerator.

When it comes to engine power, the Mercedes B Class offers clearly more power – delivering 238 HP compared to 186 HP. That’s roughly 52 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes B Class is clearly quicker – completing the sprint in 6.5 s, while the Mazda 3 Sedan takes 8.1 s. That’s about 1.6 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers noticeably more torque with 400 Nm compared to 240 Nm. That’s about 160 Nm more.

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, Mercedes B Class is very slightly lighter – 1,405 kg compared to 1,420 kg. The difference is around 15 kg.

Looking at boot space, the Mercedes B Class offers very slightly more boot space – 455 L compared to 450 L. That’s a difference of about 5 L.

When it comes to payload, the Mercedes B Class carries slightly more – 550 kg compared to 481 kg. That’s a difference of about 69 kg.

Who wins the race in the data check?

The Mercedes B Class is far ahead overall 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
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Frequently compared as well

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Mazda 3 Sedan
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mazda 3 Sedan

The Mazda 3 Sedan dresses like a compact premium car, with sculpted lines and an interior that punches well above its class. It rewards drivers with eager handling and a composed, comfortable ride that turns routine runs into something a bit more enjoyable — proof that style and substance can share the same key.

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Reviews Mazda 3 Sedan

4.7 (1 Reviews)
rate

No reviews yet. Share your experience and help others decide.

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.

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18C0947_044

Reviews Mercedes B Class

4.9 (5 Reviews)
rate
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

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Mazda 3 Sedan
Mercedes B Class

Costs and Consumption
Price
25,000 - 34,200 £
Price
33,100 - 52,500 £
Consumption L/100km
5.5 - 6.1 L/100km
Consumption L/100km
5.1 - 6.9 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
123 - 135 g/km
co2
133 - 156 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Sedan
Body Type
MPV
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,420 - 1,492 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
450 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,795 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
467 - 481 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Petrol MHEV
Engine Type
Petrol MHEV, Diesel
Transmission
Manuel, Automatic
Transmission
Automatic
Transmission Detail
Manual Gearbox, Automatic Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
Front-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
140 - 186 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
8.1 - 9.8 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
238 - 240 Nm
Torque
200 - 400 Nm
Number of Cylinders
4
Number of Cylinders
4
Power kW
103 - 137 kW
Power kW
85 - 175 kW
Engine capacity
1,998 - 2,488 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
D
CO2 Efficiency Class
D, E, F
Brand
Mazda
Brand
Mercedes-Benz
What drivetrain options does the Mazda 3 Sedan have?

The Mazda 3 Sedan is offered with Front-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.