Compare the2025 GMC Hummer EV SUVVS 2024 Porsche Cayenne

Both the Hummer EV SUV and Cayenne have child safety locks to prevent children from opening the rear doors. The Hummer EV SUV has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The Cayenne’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the Hummer EV SUV are reminded to check the back seat if they opened the rear door before starting out. The Cayenne doesn’t offer a back seat reminder.

The Hummer EV SUV’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The Cayenne doesn’t offer a driver alert monitor.

Both the Hummer EV SUV and the Cayenne have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras and rear cross-path warning.

The GMC Hummer EV SUV weighs 3236 to 4222 pounds more than the Porsche Cayenne. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

GMC’s powertrain warranty covers the Hummer EV SUV 1 year and 10,000 miles longer than Porsche covers the Cayenne. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 5 years or 60,000 miles. Coverage on the Cayenne ends after only 4 years or 50,000 miles.

There are over 8 times as many GMC dealers as there are Porsche dealers, which makes it much easier should you ever need service under the Hummer EV SUV’s warranty.

The Hummer EV SUV has more powerful engines than the Cayenne:

As tested in Car and Driver the Hummer EV SUV 3X is faster than the Porsche Cayenne turbo V6:

On the EPA test cycle the Hummer EV SUV gets better mileage than the Cayenne running its gasoline engine:

The Hummer EV SUV can travel with zero emissions for 282 to 315 miles (dependent on model). The Cayenne can’t move without running its internal combustion engine.

In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The Hummer EV SUV has standard Brake Assist to detect emergency braking situations (by how hard and how quickly the brake pedal is pressed) and then automatically apply maximum braking immediately in order to help prevent a collision. The Cayenne doesn’t offer a brake assist feature.

For better traction, the Hummer EV SUV has larger tires than the Cayenne (305/55R22 vs. 255/55R20). The Hummer EV SUV’s tires are larger than the largest tires available on the Cayenne (305/55R22 vs. 285/45R21).

The GMC Hummer EV SUV’s wheels have 8 lugs for longer wheel bearing life, less chance of rotor warping and greater strength. The Porsche Cayenne only has 5 wheel lugs per wheel.

The Hummer EV SUV has a standard full size spare tire so a flat doesn’t interrupt your trip. A full size spare isn’t available on the Cayenne; it requires you to depend on a temporary spare, which has mileage and speed limitations, or roadside assistance and a tow-truck.

The front and rear suspension of the Hummer EV SUV uses air springs for a smoother, controlled ride than the Cayenne, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

For a smoother ride and more stable handling, the Hummer EV SUV’s wheelbase is 12.7 inches longer than on the Cayenne (126.7 inches vs. 114 inches).

For better maneuverability, the Hummer EV SUV’s turning circle is 4.3 feet tighter than the Cayenne Turbo E-Hybrid’s (35.4 feet vs. 39.7 feet). The Hummer EV SUV’s turning circle is 4.6 feet tighter than the Cayenne’s (35.4 feet vs. 40 feet).

For greater off-road capability the Hummer EV SUV has a 7.9 inches greater minimum ground clearance than the Cayenne E-Hybrid (16 vs. 8.1 inches), allowing the Hummer EV SUV to travel over rougher terrain without being stopped or damaged. The Hummer EV SUV’s minimum ground clearance is 6.5 inches higher than on the Cayenne Turbo E-Hybrid (16 vs. 9.5 inches).

The Hummer EV SUV has 3.5 inches more front headroom, 4.5 inches more front legroom, 4.8 inches more front shoulder room and 7.5 inches more rear shoulder room than the Cayenne.

The Hummer EV SUV has a much larger cargo volume with its rear seat up than the Cayenne with its rear seat up (35.9 vs. 27.2 cubic feet). The Hummer EV SUV has a much larger cargo volume with its rear seat folded than the Cayenne with its rear seat folded (81.8 vs. 60.3 cubic feet).

Pressing a switch automatically lowers the Hummer EV SUV’s rear seats, to make changing between passengers and cargo easier. The Cayenne doesn’t offer automatic folding seats.

The Hummer EV SUV’s rear cargo window opens separately from the rest of the right swing out door to allow quicker loading of small packages. The Cayenne’s rear cargo window doesn’t open.

The Hummer EV SUV’s standard towing capacity is much higher than the Cayenne’s (10,000 vs. 7700 pounds).

The Hummer EV SUV has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The Cayenne doesn’t offer a remote starting system.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the Hummer EV SUV has standard extendable sun visors. The Cayenne doesn’t offer extendable visors.

The Hummer EV SUV has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the vehicle heater warms up. A heated steering wheel costs extra on the Cayenne.

The Hummer EV SUV has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Cayenne doesn’t offer a house-current electrical outlet.