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Mazda MX-5 Roadster vs Mercedes B Class comparison

Compare performance (132 HP vs 238 HP), boot space and price (29,000 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – Mazda MX-5 Roadster or Mercedes B Class?

Mazda MX-5 Roadster vs Mercedes B Class: Key differences

Mazda MX-5 Roadster

  • somewhat cheaper
  • markedly lighter
details

Mercedes B Class

4.9 (5 Reviews)
rate
  • substantially more power
  • noticeably more efficient
  • noticeably quicker 0–100 km/h
  • substantially 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.

By Achim Sedelmaier

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

MX-5 Roadster

Costs and Efficiency:

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

Mazda MX-5 Roadster is somewhat cheaper – starting at 29,000 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 4,167 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is noticeably more efficient than the Mazda MX-5 Roadster with 6.2 L/100km. The difference is about 1.1 L/100km.

B Class

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 B Class offers substantially more power – delivering 238 HP compared to 132 HP. That’s roughly 106 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 Mazda MX-5 Roadster takes 8.3 s. That’s about 1.8 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers significantly more torque with 400 Nm compared to 152 Nm. That’s about 248 Nm more.

MX-5 Roadster

Space and Everyday Use:

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

Seats: Mercedes B Class offers more seats – 5 vs 2.

In terms of curb weight, Mazda MX-5 Roadster is markedly lighter – 1,078 kg compared to 1,405 kg. The difference is around 327 kg.

Looking at boot space, the Mercedes B Class offers substantially more boot space – 455 L compared to 130 L. That’s a difference of about 325 L.

When it comes to payload, the Mercedes B Class carries considerably more – 550 kg compared to 152 kg. That’s a difference of about 398 kg.

Who wins the race in the data check?

The Mercedes B Class holds a decisive overall lead 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 MX-5 Roadster
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mazda MX-5 Roadster

The Mazda MX-5 is a featherweight, open-top sports car that turns ordinary roads into a grin-inducing playground thanks to razor-sharp steering and an engaging, tactile gearbox. It won’t swallow the weekly shopping or ski bags, but for anyone after pure driving fun and sun-on-your-face weekends, few cars match its sheer charm and value.

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Reviews Mazda MX-5 Roadster

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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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 MX-5 Roadster
Mercedes B Class

Costs and Consumption
Price
29,000 - 34,300 £
Price
33,100 - 52,500 £
Consumption L/100km
6.2 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
140 g/km
co2
133 - 156 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Roadster
Body Type
MPV
Seats
2
Seats
5
Doors
-
Doors
-
Curb weight
1,078 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
130 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,735 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
152 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Petrol
Engine Type
Petrol MHEV, Diesel
Transmission
Manuel
Transmission
Automatic
Transmission Detail
Manual Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
Rear-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
132 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
8.3 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
152 Nm
Torque
200 - 400 Nm
Number of Cylinders
4
Number of Cylinders
4
Power kW
97 kW
Power kW
85 - 175 kW
Engine capacity
1,496 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
E
CO2 Efficiency Class
D, E, F
Brand
Mazda
Brand
Mercedes-Benz
What drive types are available for the Mazda MX-5 Roadster?

The Mazda MX-5 Roadster is available as Rear-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.