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Lexus RZ vs Mercedes B Class comparison

Compare performance (408 HP vs 238 HP), boot space and price (48,900 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – Lexus RZ or Mercedes B Class?

Lexus RZ vs Mercedes B Class: Key differences

Lexus RZ

4.8 (2 Reviews)
rate
  • clearly more power
  • considerably quicker 0–100 km/h
  • slightly more trunk space
details

Mercedes B Class

4.9 (6 Reviews)
rate
  • considerably cheaper
  • clearly 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

RZ

Costs and Efficiency:

When it comes to price and running costs, the biggest differences usually appear. This is often where you see which car fits your budget better in the long run.

Mercedes B Class is considerably cheaper – starting at 33,100 £ , while the Lexus RZ costs 48,900 £ . That’s a price difference of around 15,813 £.

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 Lexus RZ offers clearly more power – delivering 408 HP compared to 238 HP. That’s roughly 170 HP more horsepower.

When accelerating from 0 to 100 km/h, the Lexus RZ is considerably quicker – completing the sprint in 4.4 s, while the Mercedes B Class takes 6.5 s. That’s about 2.1 s quicker.

There’s also a difference in torque: the Lexus RZ delivers visibly more torque with 538 Nm compared to 400 Nm. That’s about 138 Nm more.

RZ

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Both vehicles offer seating for 5 people.

In terms of curb weight, Mercedes B Class is clearly lighter – 1,405 kg compared to 1,995 kg. The difference is around 590 kg.

Looking at boot space, the Lexus RZ offers slightly more boot space – 522 L compared to 455 L. That’s a difference of about 67 L.

When it comes to payload, the Mercedes B Class carries very slightly more – 550 kg compared to 540 kg. That’s a difference of about 10 kg.

Who wins the race in the data check?

The Lexus RZ 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 £48,900
RZ

Lexus RZ

  • Engine Type Electric
  • Transmission Automatic
  • Drive Type Front-Wheel Drive, All-Wheel Drive
  • Power HP 227 - 408 HP
  • Consumption kWh/100km 14.7 - 18.1 kWh/100km
  • Electric Range 457 - 559 km
details

Frequently compared as well

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Mercedes B Class
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Mercedes B Class
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Lexus RZ
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Lexus RZ

The Lexus RZ brings Lexus' trademark quiet luxury to the electric SUV world, wrapping poised handling and a plush, well-crafted cabin in a calm, composed package. It won't shout about raw figures — instead it trades headline numbers for smooth power delivery, fuss-free tech and an effortless refinement that will suit buyers who want electric convenience without losing the luxury experience.

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Reviews Lexus RZ

4.8 (2 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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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

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Lexus RZ
Mercedes B Class

Costs and Consumption
Price
48,900 - 67,500 £
Price
33,100 - 52,500 £
Consumption L/100km
-
Consumption L/100km
5.1 - 6.9 L/100km
Consumption kWh/100km
14.7 - 18.1 kWh/100km
Consumption kWh/100km
-
Electric Range
457 - 559 km
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
0 g/km
co2
133 - 156 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
SUV
Body Type
MPV
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,995 - 2,135 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
522 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,895 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
505 - 540 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Electric
Engine Type
Petrol MHEV, Diesel
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Reduction Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
227 - 408 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
4.4 - 7.5 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
269 - 538 Nm
Torque
200 - 400 Nm
Number of Cylinders
-
Number of Cylinders
4
Power kW
167 - 300 kW
Power kW
85 - 175 kW
Engine capacity
-
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
A
CO2 Efficiency Class
D, E, F
Brand
Lexus
Brand
Mercedes-Benz
What drive types are available for the Lexus RZ?

The Lexus RZ is offered with 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.