2025 Mercedes-Benz GLB-Class vs 2026 Acura RDX
Comparison Overview
The most significant measurable divergence between the 2025 Mercedes-Benz GLB-Class ($45,800 MSRP) and the 2026 Acura RDX ($45,100 MSRP) resides in powertrain output, where the RDX generates 272 hp versus the GLB-Class's 221 hp—a 51 hp advantage. This performance disparity is coupled with a drivetrain configuration difference: the RDX utilizes standard All-Wheel Drive (AWD) while the GLB-Class employs Front Wheel Drive (FWD). Conversely, the GLB-Class demonstrates superior fuel economy, achieving a 28 MPG combined rating compared to the RDX’s 23 MPG combined, resulting in a notable 5 MPG efficiency gap. Dimensional analysis shows the RDX is 5.0 inches longer (187.4 inches vs. 182.4 inches) but the GLB-Class sacrifices cargo space (22 cu ft versus the RDX's 29.5 cu ft). Furthermore, the RDX uses a 10-speed automatic transmission against the GLB-Class’s 8-speed automated manual.
Size Comparison
Performance
Fuel Efficiency
Full Specifications
Our Verdicts
2025 Mercedes-Benz GLB-Class
The GLB-Class offers superior fuel efficiency at 28 MPG combined versus the RDX's 23 MPG combined, alongside a marginally lower initial MSRP.
2026 Acura RDX
The RDX provides substantially more utility with 29.5 cu ft of cargo capacity compared to the GLB-Class’s 22 cu ft.
2026 Acura RDX
The RDX offers 272 hp and 280 lb-ft of torque, significantly outpacing the GLB-Class's 221 hp and 258 lb-ft, supported by standard AWD.
2026 Acura RDX
Despite a similar price point ($45,100 vs $45,800), the RDX delivers 51 more horsepower, superior cargo volume, and standard AWD.
Choose the Mercedes-Benz GLB-Class if...
- Fuel economy is a primary purchasing factor, as the GLB-Class achieves 28 combined MPG.
- Buyers prioritize a slightly smaller exterior footprint (182.4 inches in length) for easier urban parking.
- Standard FWD operation paired with an 8-speed automated manual transmission is preferred.
Choose the Acura RDX if...
- Maximum usable cargo volume is required, with the RDX offering 29.5 cu ft.
- A greater emphasis is placed on longitudinal performance, evidenced by 272 hp.
- Standard AWD capability is necessary for handling diverse weather conditions.
Key Dimensions
| Dimension | Mercedes-Benz GLB-Class | Acura RDX |
|---|---|---|
| Length | 182.4" | 187.4" |
| Width | 72.2" | 74.8" |
| Height | 66.7" | 65.7" |
| Wheelbase | 111.4" | 108.3" |
Features Comparison
Safety
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| 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 | 3 |
| 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 | — | ✓ |
Engine
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Base Engine Displacement | 2.0 L | 2.0 L |
| Number of Cylinders | inline 4 | inline 4 |
| Base Engine Type | mild hybrid | gas |
| Horsepower | 221 hp @ 5500 rpm | 272 hp @ 6500 rpm |
| Torque | 258 lb-ft @ 1800 rpm | 280 lb-ft @ 1600 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 | Acura |
|---|---|---|
| Transmission Type | 8-speed automated manual | 10-speed shiftable automatic |
| Drivetrain Type | front wheel drive | all wheel drive |
| [object Object] | — | ✓ |
| [object Object] | — | ✓ |
Fuel
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Fuel Type | premium unleaded (required) | premium unleaded (recommended) |
| EPA Fuel Economy (City/Highway) | 25/33 MPG | 21/27 MPG |
| EPA Fuel Economy (Combined) | 28 MPG | 23 MPG |
| EPA Driving Range (City/Highway) | 397.5/524.7 mi. | 359.1/461.7 mi. |
| Fuel Tank Capacity | 15.9 gal. | 17.1 gal. |
Comfort & Convenience
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| 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 | ✓ | ✓ |
| Adaptive Cruise Control | — | ✓ |
In Car Entertainment
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Infotainment Display | 10.25 in | 10.2 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 |
| Speaker System | — | 9 |
| Subwoofer Count | — | 1 |
| Speed Sensitive Volume Control | — | ✓ |
Power Feature
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| One-Touch Power Windows | 4 | 4 |
| Keyless Entry | ✓ | ✓ |
| Heated Mirrors | ✓ | ✓ |
| Moonroof Type | — | 1st Row Power Glass |
| Reverse Tilt Passenger Mirror | — | ✓ |
Frontseats
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Front Head Room | 40.7 in. | 40.0 in. |
| Front Leg Room | 41.1 in. | 42.0 in. |
| Front Shoulder Room | 55.9 in. | 60.0 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 | 8-way |
| Passenger Seat Height Adjustment | ✓ | ✓ |
| Passenger Seat Lumbar Support | Power | 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 | — | 55.0 in. |
Rearseats
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Rear Head Room | 39.3 in. | 38.0 in. |
| Rear Leg Room | 38.1 in. | 38.0 in. |
| Rear Shoulder Room | 54.9 in. | 57.0 in. |
| Split-Folding Rear Seatback | ✓ | ✓ |
| Reclining Rear Seats | ✓ | — |
| Folding Center Armrest | ✓ | ✓ |
| Rear Hip Room | — | 50.0 in. |
Tires and Wheels
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Wheel Material | Alloy | — |
| Wheel Size | 18 x 7.5 in | 19 x 8.0 in |
| Tire Size | 235/55R18 | 235/55R19 |
| Run Flat Tires | ✓ | — |
| Wheel Finish | — | Painted Alloy |
| Tire Type | — | All Season |
| Spare Tire Type | — | Temporary |
| Spare Tire Location | — | Inside Mounted |
Suspension
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Four-Wheel Independent Suspension | ✓ | ✓ |
| Front Stabilizer Bar | ✓ | ✓ |
| Rear Stabilizer Bar | ✓ | ✓ |
Warranty
| Feature | Mercedes-Benz | Acura |
|---|---|---|
| Basic Warranty | 4 yr./ 50000 mi. | 4 yr./ 50000 mi. |
| Drivetrain Warranty | 4 yr./ 50000 mi. | 6 yr./ 70000 mi. |
| Corrosion/Rust Warranty | 4 yr./ 50000 mi. | 5 yr./ unlimited mi. |
| Roadside Assistance | 4 yr./ 50000 mi. | 4 yr./ 50000 mi. |
| Complimentary Scheduled Maintenance | — | 1 yr./ 12000 mi. |
Frequently Asked Questions
Common questions about comparing the 2025 Mercedes-Benz GLB-Class and 2026 Acura RDX.
How does the required fuel type affect ownership costs between these two crossovers?
The 2025 Mercedes-Benz GLB-Class explicitly requires premium unleaded fuel, potentially increasing operational expenses. The 2026 Acura RDX only recommends premium unleaded, offering greater flexibility in fuel choices.
What is the measurable difference in passenger volume metrics between the two vehicles?
While precise passenger volume is not listed, the RDX is 5.0 inches longer (187.4 in vs. 182.4 in) and 2.6 inches wider (74.8 in vs. 72.2 in), suggesting a potentially larger cabin envelope than the GLB-Class.
Which vehicle provides better initial highway cruising efficiency?
The 2025 Mercedes-Benz GLB-Class achieves 33 MPG on the highway, substantially exceeding the 2026 Acura RDX's 27 MPG highway rating.
Comparing the transmissions, how do the gearbox counts differ?
The RDX utilizes a 10-speed shiftable automatic transmission, whereas the GLB-Class employs an 8-speed automated manual transmission.
Is the RDX physically taller than the GLB-Class?
No, the 2025 Mercedes-Benz GLB-Class is 1.0 inch taller, measuring 66.7 inches in height compared to the RDX’s 65.7 inches.
How close are the base MSRPs for the 2025 GLB-Class and the 2026 RDX?
The initial pricing is closely matched, with the RDX listing at $45,100 and the GLB-Class at $45,800, representing a $700 difference.
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