Compare the2024 Infiniti QX55VS 2024 Porsche Cayenne Coupe

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 QX55 are reminded to check the back seat if they opened the rear door before starting out. The Cayenne Coupe doesn’t offer a back seat reminder.

Both the QX55 and the Cayenne Coupe have standard driver and passenger frontal airbags, front and rear side-impact airbags, driver and front passenger knee 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, rear cross-path warning and available around view monitors.

The QX55 comes with a full 4-year/60,000-mile basic warranty, which covers the entire truck and includes 24-hour roadside assistance. The Cayenne Coupe’s 4-year/50,000-mile basic warranty expires 10,000 miles sooner.

Infiniti’s powertrain warranty covers the QX55 2 years and 20,000 miles longer than Porsche covers the Cayenne Coupe. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the Cayenne Coupe ends after only 4 years or 50,000 miles.

Infiniti pays for scheduled maintenance on the QX55 for 2 years and 26000 miles longer than Porsche pays for maintenance for the Cayenne Coupe (3/36,000 vs. 1/10,000).

On the EPA test cycle the QX55 gets better mileage than the Cayenne Coupe running its gasoline engine:

The QX55 has a standard continuously variable transmission (CVT). With no “steps” between gears, it can keep the engine at the most efficient speed for fuel economy, or keep it at its peak horsepower indefinitely for maximum acceleration. The Cayenne Coupe doesn’t offer a CVT.

In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The QX55 has a standard brake assist system 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 Coupe doesn’t offer a brake assist feature.

The QX55’s tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the Cayenne Coupe’s standard 55 series front tires.

The QX55 has a standard easy tire fill system. When inflating the tires, the vehicle’s integrated tire pressure sensors keep track of the pressure as the tires fill and tell the driver when the tires are inflated to the proper pressure. The Cayenne Coupe doesn’t offer vehicle monitored tire inflation.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the QX55 can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Cayenne Coupe doesn’t offer run-flat tires.

For better maneuverability, the QX55’s turning circle is 1.6 feet tighter than the Cayenne Turbo GT’s (36.4 feet vs. 38 feet). The QX55’s turning circle is 3.6 feet tighter than the Cayenne Coupe’s (36.4 feet vs. 40 feet).

For greater off-road capability the QX55 has a greater minimum ground clearance than the Cayenne E-Hybrid Coupe (8.6 vs. 8.2 inches), allowing the QX55 to travel over rougher terrain without being stopped or damaged.

The Infiniti QX55 may be more efficient, handle and accelerate better because it weighs about 650 to 1600 pounds less than the Porsche Cayenne Coupe.

The QX55 is 7.7 inches shorter than the Cayenne Coupe, making the QX55 easier to handle, maneuver and park in tight spaces.

The QX55 uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The Cayenne Coupe doesn’t offer active noise cancellation.

The QX55 has 1.7 inches more front headroom and .6 inches more rear shoulder room than the Cayenne Coupe.

The QX55 has a much larger cargo volume with its rear seat up than the Cayenne Coupe with its rear seat up (26.9 vs. 20.9 cubic feet). The QX55 has a much larger cargo volume with its rear seat folded than the Cayenne Coupe with its rear seat folded (54.1 vs. 53 cubic feet).

Pulling a handle automatically lowers the QX55’s rear seats, to make changing between passengers and cargo easier. The Cayenne Coupe doesn’t offer automatic folding seats.

The QX55 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 Coupe doesn’t offer a remote starting system.

The QX55’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The Cayenne Coupe’s cruise control switches are unlit, making them difficult to find at night and operate safely.

To improve rear visibility by keeping the rear window clear, the QX55 has a standard rear wiper. The Cayenne Coupe doesn’t offer a rear wiper.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the QX55 has standard extendable sun visors. The Cayenne Coupe doesn’t offer extendable visors.

Insurance will cost less for the QX55 owner. The Complete Car Cost Guide estimates that insurance for the QX55 will cost $4370 to $12805 less than the Cayenne Coupe over a five-year period.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Infiniti QX55 will be $28159 to $112448 less than for the Porsche Cayenne Coupe.