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Mercedes B Class vs Porsche Cayenne comparison

Compare performance (238 HP vs 1,156 HP), boot space and price (33,100 £ vs 90,200 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or Porsche Cayenne?

Mercedes B Class vs Porsche Cayenne: Key differences

Mercedes B Class

4.9 (6 Reviews)
rate
  • considerably cheaper
  • considerably lighter
details

Porsche Cayenne

3.2 (3 Reviews)
rate
  • substantially more power
  • visibly more efficient
  • considerably quicker 0–100 km/h
  • considerably 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

B Class

Costs and Efficiency:

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

Mercedes B Class is considerably cheaper – starting at 33,100 £ , while the Porsche Cayenne costs 90,200 £ . That’s a price difference of around 57,042 £.

Fuel consumption also shows a difference: the Porsche Cayenne uses 4 L/100km and is visibly more efficient than the Mercedes B Class with 5.1 L/100km. The difference is about 1.1 L/100km.

Cayenne

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 Porsche Cayenne offers substantially more power – delivering 1,156 HP compared to 238 HP. That’s roughly 918 HP more horsepower.

When accelerating from 0 to 100 km/h, the Porsche Cayenne is considerably quicker – completing the sprint in 2.5 s, while the Mercedes B Class takes 6.5 s. That’s about 4 s quicker.

There’s also a difference in torque: the Porsche Cayenne delivers substantially more torque with 1,500 Nm compared to 400 Nm. That’s about 1,100 Nm more.

B Class

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, Mercedes B Class is considerably lighter – 1,405 kg compared to 2,130 kg. The difference is around 725 kg.

Looking at boot space, the Porsche Cayenne offers considerably more boot space – 781 L compared to 455 L. That’s a difference of about 326 L.

When it comes to payload, the Porsche Cayenne carries noticeably more – 705 kg compared to 550 kg. That’s a difference of about 155 kg.

Who wins the race in the data check?

The Porsche Cayenne 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 £90,200
Cayenne

Porsche Cayenne

  • Engine Type Petrol, Plugin Hybrid, Electric
  • Transmission Automatic
  • Drive Type All-Wheel Drive
  • Power HP 353 - 1,156 HP
  • Consumption L/100km 4 - 11 L/100km
  • Consumption kWh/100km 18.9 - 20.6 kWh/100km
  • Electric Range 74 - 668 km
details

Frequently compared as well

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Mercedes B Class
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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

Porsche Cayenne

Few SUVs blend athletic poise and Teutonic precision like the Porsche Cayenne, putting genuine sports‑car feeling into a roomy, everyday package. If you want a practical family hauler that still makes you grin every time you merge, the Cayenne delivers — turning errands into an excuse for a spirited drive.

details
P17_0701
P17_0780
P17_0777
P17_0776
P17_0784

Reviews Porsche Cayenne

3.2 (3 Reviews)
rate

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

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Mercedes B Class
Porsche Cayenne

Costs and Consumption
Price
33,100 - 52,500 £
Price
90,200 - 144,400 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
4 - 11 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
18.9 - 20.6 kWh/100km
Electric Range
-
Electric Range
74 - 668 km
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
0 - 249 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
SUV
Seats
5
Seats
4 - 5
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
2,130 - 2,725 kg
Trunk capacity
445 - 455 L
Trunk capacity
434 - 781 L
Length
-
Length
-
Width
1,796 mm
Width
1,980 - 1,983 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
525 - 705 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Petrol, Plugin Hybrid, Electric
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Automatic Gearbox, Reduction Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
All-Wheel Drive
Power HP
116 - 238 HP
Power HP
353 - 1,156 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
2.5 - 6 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
500 - 1,500 Nm
Number of Cylinders
4
Number of Cylinders
6
Power kW
85 - 175 kW
Power kW
260 - 850 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
2,995 cm3

General
Model Year
2025
Model Year
2,025 - 2,026
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
G, B, A
Brand
Mercedes-Benz
Brand
Porsche
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.