2025 Mercedes-Benz GLS-Class vs 2025 Porsche Cayenne
Comparison Overview
Choosing between the 2025 Mercedes-Benz GLS-Class and the 2025 Porsche Cayenne often comes down to balancing outright luxury space against driving dynamics and a lower starting cost. If you need maximum utility, the GLS boasts a significant size advantage, measuring 205.0 inches long compared to the Cayenne's 194.1 inches, though this bulk comes with a slightly smaller 17.4 cu ft of standard cargo space versus the Cayenne's more accommodating 27.3 cu ft. The GLS leads in performance metrics with 375 hp and 369 lb-ft of torque versus the Cayenne's 348 hp, though the efficiency gap is minor, with the GLS netting 21 MPG combined against the Cayenne's 19 MPG combined. However, the Cayenne saves you $4,500 upfront, starting at an MSRP of $84,700 versus the GLS's $89,200. The ultimate choice hinges on whether you prioritize the bigger, more powerful three-row experience of the Mercedes or the tighter, better-packaged utility of the Porsche.
Size Comparison
Performance
Fuel Efficiency
Full Specifications
Our Verdicts
2025 Mercedes-Benz GLS-Class
The GLS offers slightly better combined fuel economy at 21 MPG compared to the Cayenne's 19 MPG, making daily drives marginally cheaper.
2025 Mercedes-Benz GLS-Class
Despite the cargo mismatch, the GLS is significantly longer (205.0 inches) and likely offers superior third-row space for growing families.
2025 Mercedes-Benz GLS-Class
The Mercedes GLS offers a higher output of 375 hp and 369 lb-ft of torque, giving it the edge in pure power.
2025 Porsche Cayenne
The Cayenne provides a $4,500 lower starting MSRP and superior standard cargo capacity (27.3 cu ft vs 17.4 cu ft) for less money.
Choose the Mercedes-Benz GLS-Class if...
- You need the highest horsepower available, with the GLS offering 375 hp.
- Maximum road presence and interior room are critical, evidenced by its 205.0-inch length.
- You prefer the slightly improved efficiency of 21 MPG combined versus the Cayenne's 19 MPG.
Choose the Porsche Cayenne if...
- Saving $4,500 on the initial purchase price is important, with an MSRP of $84,700.
- You require more standard enclosed storage space, as the Cayenne offers 27.3 cu ft versus the GLS's 17.4 cu ft.
- You want a slightly less bulky vehicle for navigating tight city streets, as it is shorter and narrower than the GLS.
Key Dimensions
| Dimension | Mercedes-Benz GLS-Class | Porsche Cayenne |
|---|---|---|
| Length | 205.0" | 194.1" |
| Width | 79.9" | 78.1" |
| Height | 71.8" | 66.9" |
| Wheelbase | 123.4" | 114.0" |
Features Comparison
Safety
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Blind Spot Monitor | ✓ | ✓ |
| Lane Departure Warning | ✓ | ✓ |
| Lane Keeping Assist System | ✓ | ✓ |
| Front Cross Traffic Alert | ✓ | — |
| Rear Cross Traffic Alert | ✓ | ✓ |
| Driver Attention Alert | ✓ | — |
| Pre-Collision Safety System | ✓ | ✓ |
| Post-Collision Safety System | ✓ | ✓ |
| Dual Front Side-Mounted Airbags | ✓ | ✓ |
| Front Head Airbags | ✓ | ✓ |
| Rear Head Airbags | ✓ | ✓ |
| Third Row 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 Ventilated Disc Brakes | ✓ | ✓ |
| Brake Preparation System | ✓ | — |
| Brake Assist | ✓ | ✓ |
| Tire Pressure Monitoring System | ✓ | ✓ |
| Automatic Headlights | ✓ | ✓ |
| Headlight Delay-Off | ✓ | ✓ |
| LED Headlights | ✓ | ✓ |
| Adaptive Headlights | ✓ | ✓ |
| Daytime Running Lights | ✓ | ✓ |
| Cornering Lights | ✓ | ✓ |
| Integrated Turn Signal Mirrors | ✓ | ✓ |
| Front Headrests | 2 | 2 |
| Front Power Adjustable Headrests | ✓ | — |
| Rear Headrests | 3 | 3 |
| Rear Height Adjustable Headrests | ✓ | — |
| Rear Center 3-Point Seatbelt | ✓ | ✓ |
| Anti-Theft Alarm System (Remote) | ✓ | ✓ |
| Engine Immobilizer | ✓ | ✓ |
| Dual Rear Side-Mounted Airbags | — | ✓ |
| Front Multi-Adjustable Headrests | — | ✓ |
| Rear Multi-Adjustable Headrests | — | ✓ |
Engine
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Base Engine Displacement | 3.0 L | 3.0 L |
| Number of Cylinders | inline 6 | V6 |
| Base Engine Type | mild hybrid | gas |
| Horsepower | 375 hp @ 5800 rpm | 348 hp @ 5400 rpm |
| Torque | 369 lb-ft @ 1800 rpm | 368 lb-ft @ 1450 rpm |
| Number of Valves | 24 | 24 |
| Camshaft Type | Double overhead cam (DOHC) | Double overhead cam (DOHC) |
| Variable Valve Timing | Variable | Variable |
| Fuel Injection Type | ✓ | ✓ |
Drive Train
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Transmission Type | 9-speed shiftable automatic | 8-speed shiftable automatic |
| Drivetrain Type | all wheel drive | all wheel drive |
| Center Differential Type | Limited Slip | Limited Slip |
| Hill Descent Control | ✓ | ✓ |
Fuel
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Fuel Type | premium unleaded (required) | premium unleaded (required) |
| EPA Fuel Economy (City/Highway) | 19/24 MPG | 17/23 MPG |
| EPA Fuel Economy (Combined) | 21 MPG | 19 MPG |
| EPA Driving Range (City/Highway) | 452.2/571.2 mi. | 402.9/545.1 mi. |
| Fuel Tank Capacity | 23.8 gal. | 23.7 gal. |
Comfort & Convenience
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Push Button Start | ✓ | ✓ |
| Power Tilt and Telescopic Steering Wheel | ✓ | ✓ |
| Transmission Controls on Steering Wheel | ✓ | ✓ |
| Cruise Control on Steering Wheel | ✓ | — |
| Audio Controls on Steering Wheel | ✓ | ✓ |
| Electric Power Steering | ✓ | ✓ |
| Front View Camera | ✓ | ✓ |
| Side View Camera | ✓ | ✓ |
| Rear View Camera | ✓ | ✓ |
| Front Parking Sensors | ✓ | ✓ |
| Rear Parking Sensors | ✓ | ✓ |
| Automatic Parking Assist | ✓ | ✓ |
| Wireless Charging Pad | ✓ | ✓ |
| Adaptive Cruise Control | ✓ | — |
| Universal Remote Transmitter | ✓ | ✓ |
| Front Cupholders | ✓ | ✓ |
| Rear Cupholders | ✓ | ✓ |
| 3rd Row Cupholders | ✓ | — |
| Front Door Pockets | ✓ | ✓ |
| Rear Door Pockets | ✓ | ✓ |
| Overhead Console with Storage | ✓ | — |
| Front Seatback Storage | ✓ | ✓ |
| Power Rear Seat Easy Entry | ✓ | — |
| Leather Steering Wheel | ✓ | ✓ |
| Four Zone Climate Control | ✓ | — |
| Rear Ventilation Ducts with Fan Control | ✓ | — |
| Interior Air Filtration | ✓ | ✓ |
| Dual Vanity Mirrors | ✓ | ✓ |
| Auto-Dimming Rearview Mirror | ✓ | ✓ |
| Turn Signal Indicators in Mirrors | ✓ | ✓ |
| Cruise Control | — | ✓ |
| Dual Zone Climate Control | — | ✓ |
| Rear Ventilation Ducts | — | ✓ |
| Cooled Storage Compartment | — | ✓ |
In Car Entertainment
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Infotainment Display | 12.3 in | 12.3 in |
| AM/FM Stereo | ✓ | ✓ |
| Premium Speaker Brand | Burmester | — |
| Stereo Power | 590W | 150W |
| Speaker System | 13 | 10 |
| Subwoofer Count | 2 | — |
| Surround Audio | Discrete | — |
| Android Auto (Wireless) | ✓ | — |
| Apple CarPlay (Wireless) | ✓ | — |
| USB Port | ✓ | ✓ |
| USB Port with External Media Control | ✓ | ✓ |
| Satellite Radio | ✓ | ✓ |
| Satellite Radio Trial Period | 6 months | 3 months |
| Speed Sensitive Volume Control | ✓ | — |
| Android Auto (Wired) | — | ✓ |
| Apple CarPlay (Wired) | — | ✓ |
Power Feature
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| One-Touch Power Windows | 4 | 4 |
| Moonroof Type | 1st Row Power Glass Extended | — |
| Keyless Entry | ✓ | ✓ |
| Reverse Tilt Passenger Mirror | ✓ | — |
| Heated Mirrors | ✓ | ✓ |
Frontseats
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Front Head Room | 39.4 in. | — |
| Front Leg Room | 40.3 in. | — |
| Front Shoulder Room | 59.3 in. | — |
| Front Hip Room | 60.8 in. | — |
| Seat Material: Leatherette | ✓ | — |
| Front Seat Type: Bucket | ✓ | ✓ |
| Driver Seat Power Adjustments | 10-way | 8-way |
| Driver Seat Height Adjustment | ✓ | ✓ |
| Driver Seat Lumbar Support | Power | — |
| Driver Seat Thigh Extension | ✓ | — |
| Driver Seat Memory Settings | 3 | 3 |
| Passenger Seat Power Adjustments | 10-way | 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 |
| Driver Seat Ventilation | ✓ | — |
| Passenger Seat Ventilation | ✓ | — |
| Seat Material: Leather | — | ✓ |
Rearseats
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Rear Head Room | 40.2 in. | — |
| Rear Leg Room | 41.9 in. | — |
| Rear Shoulder Room | 58.5 in. | — |
| Rear Hip Room | 60.0 in. | — |
| Split-Folding Rear Seatback | ✓ | ✓ |
| Reclining Rear Seats | ✓ | ✓ |
| Folding Center Armrest | ✓ | ✓ |
| Power Folding Third Row Seat | ✓ | — |
Tires and Wheels
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Wheel Material | Alloy | Alloy |
| Wheel Size | 21 x 11.0 in. | 20 x 10.5 in. |
| Tire Type | All Season | All Season |
| Tire Size | 315/40R21 | 295/45R20 |
| Spare Tire Type | Temporary | Temporary |
| Spare Tire Location | Inside Mounted | Inside Mounted |
Suspension
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Four-Wheel Independent Suspension | ✓ | ✓ |
| Front Stabilizer Bar | ✓ | ✓ |
| Rear Stabilizer Bar | ✓ | ✓ |
Warranty
| Feature | Mercedes-Benz | Porsche |
|---|---|---|
| Basic Warranty | 4 yr./ 50000 mi. | 4 yr./ 50000 mi. |
| Drivetrain Warranty | 4 yr./ 50000 mi. | 4 yr./ 50000 mi. |
| Hybrid Component Warranty | 6 yr./ 62000 mi. | — |
| Corrosion/Rust Warranty | 4 yr./ 50000 mi. | 12 yr./ unlimited mi. |
| Roadside Assistance | 4 yr./ 50000 mi. | 4 yr./ 50000 mi. |
Frequently Asked Questions
Common questions about comparing the 2025 Mercedes-Benz GLS-Class and 2025 Porsche Cayenne.
Which SUV is physically larger, the 2025 GLS or the 2025 Cayenne?
The 2025 Mercedes-Benz GLS-Class is significantly larger, measuring 205.0 inches in length, 79.9 inches in width, and 71.8 inches in height. The Porsche Cayenne is considerably more compact across all dimensions.
How much more power does the Mercedes GLS have over the Porsche Cayenne?
The GLS offers a noticeable advantage in horsepower, producing 375 hp compared to the Cayenne's 348 hp, a difference of 27 hp. Torque figures are nearly identical, with the GLS at 369 lb-ft versus 368 lb-ft for the Cayenne.
Is the difference in cargo capacity significant between these two luxury crossovers?
Yes, the difference is substantial; the Porsche Cayenne provides 27.3 cu ft of cargo capacity behind the seats, while the larger GLS only offers 17.4 cu ft in the same configuration.
Which vehicle is the better value based on the starting price and efficiency?
The Porsche Cayenne represents better initial value with an MSRP of $84,700, saving you $4,500 compared to the GLS's $89,200. The GLS offsets this slightly with marginally better combined MPG at 21 versus 19.
Do both models require premium fuel, and what are their respective MPG ratings?
Both the 2025 GLS-Class and the 2025 Cayenne require premium unleaded fuel. The GLS achieves 21 MPG combined (19 city/24 highway), slightly edging out the Cayenne's 19 MPG combined (17 city/23 highway).
Are there any differences in the automatic transmission used in these models?
The Mercedes-Benz GLS utilizes a 9-speed shiftable automatic transmission. In contrast, the Porsche Cayenne comes equipped with an 8-speed shiftable automatic transmission.
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