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Mazda 3 Sedan vs Mercedes GLB comparison

Compare performance (186 HP vs 354 HP), boot space and price (25,400 £ vs 43,200 £ ) at a glance. Find out which car is the better choice for you – Mazda 3 Sedan or Mercedes GLB?

Mazda 3 Sedan vs Mercedes GLB: Key differences

Mazda 3 Sedan

4.7 (1 Reviews)
rate
  • substantially cheaper
  • marginally more efficient
  • markedly lighter
details

Mercedes GLB

3.6 (4 Reviews)
rate
  • considerably more power
  • substantially quicker 0–100 km/h
  • moderately more trunk space
details

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

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

3 Sedan

Costs and Efficiency:

Price and efficiency are often the first things buyers look at. Here it becomes clear which model has the long-term edge – whether at the pump, the plug, or in purchase price.

Mazda 3 Sedan is substantially cheaper – starting at 25,400 £ , while the Mercedes GLB costs 43,200 £ . That’s a price difference of around 17,749 £.

Fuel consumption also shows a difference: the Mazda 3 Sedan uses 5.5 L/100km and is marginally more efficient than the Mercedes GLB with 5.7 L/100km. The difference is about 0.2 L/100km.

GLB

Engine and Performance:

Power, torque and acceleration say a lot about how a car feels on the road. This is where you see which model delivers more driving dynamics.

When it comes to engine power, the Mercedes GLB offers considerably more power – delivering 354 HP compared to 186 HP. That’s roughly 168 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes GLB is substantially quicker – completing the sprint in 5.5 s, while the Mazda 3 Sedan takes 8.1 s. That’s about 2.6 s quicker.

There’s also a difference in torque: the Mercedes GLB delivers considerably more torque with 515 Nm compared to 240 Nm. That’s about 275 Nm more.

Space and Everyday Use:

Whether family car or daily driver – which one offers more room, flexibility and comfort?

Both vehicles offer seating for 5 people.

In terms of curb weight, Mazda 3 Sedan is markedly lighter – 1,417 kg compared to 1,840 kg. The difference is around 423 kg.

Looking at boot space, the Mercedes GLB offers moderately more boot space – 540 L compared to 450 L. That’s a difference of about 90 L.

When it comes to payload, the Mercedes GLB carries barely more – 505 kg compared to 501 kg. That’s a difference of about 4 kg.

Who wins the race in the data check?

The Mercedes GLB 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 £43,200
GLB

Mercedes GLB

  • Engine Type Electric, Full Hybrid
  • Transmission Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 156 - 354 HP
  • Consumption L/100km 5.7 - 6.1 L/100km
  • Consumption kWh/100km 15.4 - 15.9 kWh/100km
  • Electric Range 431 - 631 km
details

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Mazda 3 Sedan
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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.

details
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Reviews Mazda 3 Sedan

4.7 (1 Reviews)
rate

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

Mercedes GLB

The Mercedes GLB is a compact luxury SUV that blends smart packaging with a polished, composed driving experience. Its flexible interior and premium feel make it a sensible pick for buyers who want Mercedes comfort and practicality in a smaller footprint.

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Reviews Mercedes GLB

3.6 (4 Reviews)
rate
Hans
19 Feb 2026, 02:39:00

Great car — very satisfied with the GLB 250 4MATIC.

How do you mainly use this car? (optional): Leisure / Weekend driver
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 GLB

Costs and Consumption
Price
25,400 - 34,700 £
Price
43,200 - 62,400 £
Consumption L/100km
5.5 - 6 L/100km
Consumption L/100km
5.7 - 6.1 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
15.4 - 15.9 kWh/100km
Electric Range
-
Electric Range
431 - 631 km
Battery Capacity
-
Battery Capacity
-
co2
123 - 137 g/km
co2
0 - 138 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Sedan
Body Type
SUV
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,417 - 1,468 kg
Curb weight
1,840 - 2,280 kg
Trunk capacity
450 L
Trunk capacity
540 L
Length
-
Length
-
Width
1,795 mm
Width
1,861 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
482 - 501 kg
Payload
485 - 505 kg

Engine and Performance
Engine Type
Petrol MHEV
Engine Type
Electric, Full Hybrid
Transmission
Manual, Automatic
Transmission
Automatic
Transmission Detail
Manual Gearbox, Automatic Gearbox
Transmission Detail
Reduction Gearbox
Drive Type
Front-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
140 - 186 HP
Power HP
156 - 354 HP
Acceleration 0-100km/h
8.1 - 9.8 s
Acceleration 0-100km/h
5.5 - 9.7 s
Max Speed
-
Max Speed
-
Torque
238 - 240 Nm
Torque
280 - 515 Nm
Number of Cylinders
4
Number of Cylinders
4
Power kW
103 - 137 kW
Power kW
115 - 260 kW
Engine capacity
1,998 - 2,488 cm3
Engine capacity
1,499 cm3

General
Model Year
2026
Model Year
2026
CO2 Efficiency Class
D, E
CO2 Efficiency Class
A, D, E
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.