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Alfa Romeo Giulia vs Mercedes GLA comparison

Compare performance (520 HP vs 421 HP), boot space and price (48,000 £ vs 38,800 £ ) at a glance. Find out which car is the better choice for you – Alfa Romeo Giulia or Mercedes GLA?

Alfa Romeo Giulia vs Mercedes GLA: Key differences

Alfa Romeo Giulia

4.1 (2 Reviews)
rate
  • moderately more power
  • somewhat quicker 0–100 km/h
  • only slightly more trunk space
details

Mercedes GLA

4.5 (4 Reviews)
rate
  • clearly cheaper
  • substantially more efficient
  • marginally 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

Giulia

Costs and Efficiency:

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

Mercedes GLA is clearly cheaper – starting at 38,800 £ , while the Alfa Romeo Giulia costs 48,000 £ . That’s a price difference of around 9,164 £.

Fuel consumption also shows a difference: the Mercedes GLA uses 2.9 L/100km and is substantially more efficient than the Alfa Romeo Giulia with 5.4 L/100km. The difference is about 2.5 L/100km.

GLA

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 Alfa Romeo Giulia offers moderately more power – delivering 520 HP compared to 421 HP. That’s roughly 99 HP more horsepower.

When accelerating from 0 to 100 km/h, the Alfa Romeo Giulia is somewhat quicker – completing the sprint in 3.9 s, while the Mercedes GLA takes 4.3 s. That’s about 0.4 s quicker.

There’s also a difference in torque: the Alfa Romeo Giulia delivers somewhat more torque with 600 Nm compared to 500 Nm. That’s about 100 Nm more.

Giulia

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 GLA is marginally lighter – 1,570 kg compared to 1,640 kg. The difference is around 70 kg.

Looking at boot space, the Alfa Romeo Giulia offers only slightly more boot space – 480 L compared to 435 L. That’s a difference of about 45 L.

When it comes to payload, the Alfa Romeo Giulia carries only slightly more – 535 kg compared to 500 kg. That’s a difference of about 35 kg.

Who wins the race in the data check?

The Mercedes GLA is decisively ahead 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 £38,800
GLA

Mercedes GLA

  • Engine Type : Petrol MHEV, Plugin Hybrid, Diesel, Petrol
  • Transmission : Automatic
  • Drive Type : Front-Wheel Drive, All-Wheel Drive
  • Power HP : 116 - 421 HP
  • Consumption L/100km : 2.9 - 9.5 L/100km
  • Electric Range : 74 km
details

Frequently compared as well

Mercedes B Class
Mercedes GLA
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The Mercedes B‑Class is the practical, airy people‑carrier that prioritises space and comfort, while the Mercedes GLA takes the same mechanical smarts and adds SUV looks, higher ride height and a touch more road presence. Pick the B‑Class for family‑friendly sense and efficiency, choose the GLA if …
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Alfa Romeo Giulia
Mercedes GLA

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Alfa Romeo Giulia

The Alfa Romeo Giulia captivates with its stunning Italian design and dynamic performance, representing a perfect blend of elegance and sportiness. Its engaging driving experience, characterised by precise handling and responsive steering, appeals to enthusiasts who crave the thrill of the road. Inside, the Giulia showcases a beautifully crafted interior that combines luxury with cutting-edge technology, making every journey a delight.

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Reviews Alfa Romeo Giulia

4.1 (2 Reviews)
rate

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

Mercedes GLA

The Mercedes GLA blends Mercedes style with compact crossover practicality, looking sharper than its size suggests while still feeling purposeful around town. Inside it serves up premium materials and tech-forward ergonomics, and the composed ride makes it an appealing pick for buyers who want luxury wrapped in a city-friendly package with a wink of adventurous spirit.

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Reviews Mercedes GLA

4.5 (4 Reviews)
rate
Lucien
1 May 2026, 07:12:24

GLA 180 petrol. Ideal for city and highway. Very smooth and quiet. The automatic gearbox is a delight. Average consumption 6.2 L/100 km. Special edition 180 Cyber Edition, leather seats....

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
Gutter
24 Feb 2026, 21:53:27

Super nimble, very impressive power from this 1,300cc mild‑hybrid engine — in town, on the road and on the motorway for this 2025 GLA 180 Style AMG... premium interior!

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
Serge
16 Jan 2026, 16:09:11

You have to compare like with like — the GLA should be compared to the Q3, not the Q2 as in your study!

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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Alfa Romeo Giulia
Mercedes GLA

Costs and Consumption
Price
48,000 - 88,300 £
Price
38,800 - 75,300 £
Consumption L/100km
5.4 - 10.1 L/100km
Consumption L/100km
2.9 - 9.5 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
74 km
Battery Capacity
-
Battery Capacity
-
co2
141 - 229 g/km
co2
66 - 216 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Sedan
Body Type
SUV
Seats
4 - 5
Seats
5
Doors
-
Doors
-
Curb weight
1,640 - 1,735 kg
Curb weight
1,570 - 1,810 kg
Trunk capacity
480 L
Trunk capacity
385 - 435 L
Length
-
Length
-
Width
1,860 - 1,874 mm
Width
1,834 - 1,849 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
415 - 535 kg
Payload
480 - 500 kg

Engine and Performance
Engine Type
Diesel, Petrol
Engine Type
Petrol MHEV, Plugin Hybrid, Diesel, Petrol
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
All-Wheel Drive, Rear-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
210 - 520 HP
Power HP
116 - 421 HP
Acceleration 0-100km/h
3.9 - 6.8 s
Acceleration 0-100km/h
4.3 - 11 s
Max Speed
-
Max Speed
-
Torque
470 - 600 Nm
Torque
230 - 500 Nm
Number of Cylinders
4 - 6
Number of Cylinders
4
Power kW
154 - 382 kW
Power kW
85 - 310 kW
Engine capacity
2,143 - 2,891 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2,025 - 2,026
Model Year
2025
CO2 Efficiency Class
E, G
CO2 Efficiency Class
E, F, B, G
Brand
Alfa Romeo
Brand
Mercedes-Benz
Is the Alfa Romeo Giulia offered with different drivetrains?

The Alfa Romeo Giulia is offered with All-Wheel Drive or 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.