2025 Mercedes-Benz GLB-Class vs 2026 GMC Acadia

$45,800 · Crossover

$43,700 · Crossover

Comparison Overview

Deciding between the compact luxury of the 2025 Mercedes-Benz GLB-Class and the recently refreshed, larger 2026 GMC Acadia often comes down to efficiency versus outright power. If you prioritize running costs, the GLB-Class saves you money, achieving 28 combined MPG while strictly requiring premium fuel. Conversely, the Acadia brings serious muscle with 328 hp and 326 lb-ft of torque, significantly more than the GLB's 221 hp and 258 lb-ft. While the Acadia is substantially larger at 204.0 inches long compared to the GLB's 182.4 inches, the GLB is surprisingly efficient on the highway at 33 MPG. Furthermore, the Acadia offers a slight edge in pure storage, providing 23 cu ft versus the GLB's 22 cu ft, making this a clear trade-off between a frugal, premium experience and robust capability.

Size Comparison

Performance

Fuel Efficiency

Full Specifications

Our Verdicts

🚗 Best for Commuters

2025 Mercedes-Benz GLB-Class

The Mercedes-Benz GLB-Class wins for commuters due to its superior 28 combined MPG, which translates to lower daily running costs.

👨‍👩‍👧‍👦 Best for Families

2026 GMC Acadia

The 2026 GMC Acadia is better suited for families needing more space, offering a longer overall length of 204.0 inches and slightly more cargo volume at 23 cu ft.

🏎️ Best for Enthusiasts

2026 GMC Acadia

Automotive enthusiasts will prefer the Acadia because it delivers substantially more power with 328 hp compared to the GLB's 221 hp.

💰 Best Value

2026 GMC Acadia

Despite a slightly lower MSRP of $43,700, the Acadia uses regular unleaded fuel, offsetting the GLB's better MPG while providing nearly 107 more horsepower.

Choose the Mercedes-Benz GLB-Class if...

You want the best fuel economy in this comparison, delivering 33 MPG on the highway.
You prefer the prestige and perceived luxury associated with the Mercedes-Benz badge.
Your budget favors a lower initial purchase price, starting at $45,800 for the GLB.

Choose the GMC Acadia if...

You need significantly more power for merging and acceleration, as the Acadia produces 328 hp.
You require slightly more overall space, as the Acadia measures 204.0 inches long and offers 23 cu ft of cargo space.
You prefer running on less expensive regular unleaded fuel rather than the GLB's required premium.

Key Dimensions

Dimension	Mercedes-Benz GLB-Class	GMC Acadia
Length	182.4"	204.0"
Width	72.2"	79.6"
Height	66.7"	71.0"
Wheelbase	111.4"	120.9"

Features Comparison

Safety

Feature	Mercedes-Benz	GMC
Blind Spot Monitor	✓	✓
Driver Attention Alert	✓	—
Pre-Collision Safety System	✓	✓
Post-Collision Safety System	✓	✓
Dual Front Side-Mounted Airbags	✓	✓
Front Head Airbags	✓	✓
Rear Head Airbags	✓	✓
Passenger Airbag Occupant Sensing Deactivation	✓	✓
Electronic Stability Control	✓	✓
Traction Control System	✓	✓
LATCH System	✓	✓
Rear Door Child Safety Locks	✓	✓
Anti-lock Brakes (ABS)	4-Wheel	4-Wheel
Brake Drying	✓	—
Front Ventilated Disc Brakes	✓	✓
Rear Solid Disc Brakes	✓	—
Brake Preparation System	✓	—
Brake Assist	✓	✓
Tire Pressure Monitoring System	✓	✓
Automatic Headlights	✓	✓
Headlight Delay-Off	✓	✓
LED Headlights	✓	✓
Daytime Running Lights	✓	✓
Front Fog Lights	✓	—
Integrated Turn Signal Mirrors	✓	✓
Front Headrests	2	2
Front Height Adjustable Headrests	✓	✓
Rear Headrests	3	2
Rear Height Adjustable Headrests	✓	—
Rear Center 3-Point Seatbelt	✓	✓
Anti-Theft Alarm System (Remote)	✓	—
Engine Immobilizer	✓	✓
Lane Departure Warning	—	✓
Lane Keeping Assist System	—	✓
Rear Cross Traffic Alert	—	✓
Third Row Head Airbags	—	✓
Rear Ventilated Disc Brakes	—	✓
Rear Fixed Headrests	—	✓

Engine

Feature	Mercedes-Benz	GMC
Base Engine Displacement	2.0 L	2.5 L
Number of Cylinders	inline 4	inline 4
Base Engine Type	mild hybrid	gas
Horsepower	221 hp @ 5500 rpm	328 hp @ 5500 rpm
Torque	258 lb-ft @ 1800 rpm	326 lb-ft @ 3500 rpm
Number of Valves	16	16
Camshaft Type	Double overhead cam (DOHC)	Double overhead cam (DOHC)
Variable Valve Timing	Variable	Variable
Fuel Injection Type	✓	✓

Drive Train

Feature	Mercedes-Benz	GMC
Transmission Type	8-speed automated manual	8-speed shiftable automatic
Drivetrain Type	front wheel drive	front wheel drive

Fuel

Feature	Mercedes-Benz	GMC
Fuel Type	premium unleaded (required)	regular unleaded
EPA Fuel Economy (City/Highway)	25/33 MPG	20/27 MPG
EPA Fuel Economy (Combined)	28 MPG	23 MPG
EPA Driving Range (City/Highway)	397.5/524.7 mi.	0/0 mi.
Fuel Tank Capacity	15.9 gal.	—

Comfort & Convenience

Feature	Mercedes-Benz	GMC
Push Button Start	✓	✓
Tilt and Telescopic Steering Wheel	✓	✓
Transmission Controls on Steering Wheel	✓	—
Cruise Control on Steering Wheel	✓	✓
Audio Controls on Steering Wheel	✓	✓
Electric Power Steering	✓	✓
Rear View Camera	✓	✓
Front Parking Sensors	✓	—
Rear Parking Sensors	✓	✓
Driver Assisted Parking Assist	✓	—
Wireless Charging Pad	✓	✓
Cruise Control	✓	—
Universal Remote Transmitter	✓	—
Front Cupholders	✓	✓
Rear Cupholders	✓	✓
Front Door Pockets	✓	✓
Rear Door Pockets	✓	—
Overhead Console with Storage	✓	—
Front Seatback Storage	✓	✓
Leather Steering Wheel	✓	—
Dual Zone Climate Control	✓	—
Rear Ventilation Ducts	✓	✓
Interior Air Filtration	✓	—
Dual Vanity Mirrors	✓	✓
Auto-Dimming Rearview Mirror	✓	—
Turn Signal Indicators in Mirrors	✓	✓
Front View Camera	—	✓
Side View Camera	—	✓
Adaptive Cruise Control	—	✓
3rd Row Cupholders	—	✓
Heated Steering Wheel	—	✓
Three Zone Climate Control	—	✓
Sun Sensor	—	✓
Digital Rearview Mirror	—	✓

In Car Entertainment

Feature	Mercedes-Benz	GMC
Infotainment Display	10.25 in	15.0 in
AM/FM Stereo	✓	✓
Android Auto (Wireless)	✓	✓
Apple CarPlay (Wireless)	✓	✓
USB Port	✓	✓
USB Port with External Media Control	✓	✓
Satellite Radio	✓	✓
Satellite Radio Trial Period	6 months	3 months
Premium Speaker Brand	—	Bose
Speaker System	—	12
Subwoofer Count	—	1
Auxiliary Audio Input	—	✓
Speed Sensitive Volume Control	—	✓

Power Feature

Feature	Mercedes-Benz	GMC
One-Touch Power Windows	4	4
Keyless Entry	✓	✓
Heated Mirrors	✓	✓

Frontseats

Feature	Mercedes-Benz	GMC
Front Head Room	40.7 in.	42.6 in.
Front Leg Room	41.1 in.	44.3 in.
Front Shoulder Room	55.9 in.	62.0 in.
Seat Material: Leatherette	✓	—
Front Seat Type: Bucket	✓	✓
Driver Seat Power Adjustments	8-way	8-way
Driver Seat Height Adjustment	✓	✓
Driver Seat Lumbar Support	Power	Power
Driver Seat Thigh Extension	✓	—
Driver Seat Memory Settings	3	—
Passenger Seat Power Adjustments	8-way	—
Passenger Seat Height Adjustment	✓	—
Passenger Seat Lumbar Support	Power	—
Passenger Seat Thigh Extension	✓	—
Passenger Seat Memory Settings	3	—
Driver Seat Heating	Multi-level	Multi-level
Passenger Seat Heating	Multi-level	Multi-level
Front Hip Room	—	59.2 in.
Seat Material: Cloth	—	✓
Passenger Seat Manual Adjustments	—	4-way

Rearseats

Feature	Mercedes-Benz	GMC
Rear Head Room	39.3 in.	40.0 in.
Rear Leg Room	38.1 in.	41.5 in.
Rear Shoulder Room	54.9 in.	62.0 in.
Split-Folding Rear Seatback	✓	✓
Reclining Rear Seats	✓	✓
Folding Center Armrest	✓	✓
Rear Hip Room	—	58.4 in.
Manual Folding Third Row Seat	—	✓

Tires and Wheels

Feature	Mercedes-Benz	GMC
Wheel Material	Alloy	—
Wheel Size	18 x 7.5 in	18 x 7.5 in
Tire Size	235/55R18	255/65R18
Run Flat Tires	✓	—
Wheel Finish	—	Painted Alloy
Tire Type	—	All Season
Spare Tire Type	—	Temporary
Spare Tire Location	—	Underbody Mounted

Suspension

Feature	Mercedes-Benz	GMC
Four-Wheel Independent Suspension	✓	✓
Front Stabilizer Bar	✓	✓
Rear Stabilizer Bar	✓	✓

Warranty

Feature	Mercedes-Benz	GMC
Basic Warranty	4 yr./ 50000 mi.	3 yr./ 36000 mi.
Drivetrain Warranty	4 yr./ 50000 mi.	5 yr./ 60000 mi.
Corrosion/Rust Warranty	4 yr./ 50000 mi.	6 yr./ 100000 mi.
Roadside Assistance	4 yr./ 50000 mi.	5 yr./ 60000 mi.
Complimentary Scheduled Maintenance	—	1 yr./ unlimited mi.

Frequently Asked Questions

Common questions about comparing the 2025 Mercedes-Benz GLB-Class and 2026 GMC Acadia.

Is the difference in horsepower between these two crossovers very noticeable?

Absolutely; the 2026 Acadia boasts 328 hp, providing a massive 107 hp advantage over the 2025 GLB's 221 hp. This means the Acadia will feel much quicker, especially when accelerating onto highways or passing.

How much more fuel-efficient is the Mercedes GLB-Class?

The GLB is significantly more efficient, achieving 28 combined MPG versus the Acadia’s 23 combined MPG. This difference is important, though keep in mind the GLB requires the more expensive premium unleaded fuel.

Which vehicle is physically larger for parking and maneuvering?

The 2026 Acadia is substantially larger in every dimension; for instance, it is 204.0 inches long compared to the GLB's 182.4 inches. If tight city parking is a priority, the smaller exterior dimensions of the GLB will be an advantage.

Do both vehicles offer the same amount of cargo space?

They are very close, but the larger Acadia wins slightly with 23 cu ft of cargo capacity behind the second row, beating the GLB's 22 cu ft. While the difference is small, the Acadia's overall larger footprint suggests more interior volume overall.

How does the required fuel type affect the long-term cost of ownership?

While the GLB gets better MPG (33 highway vs. 27 highway for the Acadia), the GLB mandates premium unleaded fuel. If you drive a lot, the lower cost of regular unleaded in the Acadia might help balance out the increased fuel consumption.

Are there significant differences in transmission types?

Yes, though both use 8-speed transmissions. The GLB uses an 8-speed automated manual, often associated with quicker shifts, while the Acadia features an 8-speed shiftable automatic, typically favored for smoother, more traditional driving engagement.