Compare the2025 Audi RS Q8VS 2025 Rolls-Royce Cullinan

For enhanced safety, the front seat shoulder belts of the Audi RS Q8 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Rolls-Royce Cullinan doesn’t offer height-adjustable seat belts.

In a Vehicle-to-Vehicle Frontal Crash Prevention 2.0 test conducted by the Insurance Institute for Highway Safety (IIHS), the Audi RS Q8 achieved a “Acceptable” rating - the second highest possible - for its performance in forward collision warning and automatic braking systems, demonstrating its excellent capabilities in preventing collisions. The Rolls-Royce Cullinan has not been tested.

Earlier warning of stopped traffic, traffic signals, dangerous road conditions, weather, or accidents, can keep driver's safer and prevent crashes. The RS Q8 has Car-to-X Services, a system that seamlessly communicates important warnings to the driver about impending danger, if they're available. The Cullinan doesn’t offer a system that can receive automated systems from infrastructure.

Both the RS Q8 and Cullinan have rear cross-traffic warning, but the RS Q8 has Automatic Brake Activation (automatically applies the brakes) to better prevent a collision when backing near traffic. The Cullinan’s Cross Traffic Warning doesn’t automatically brake.

Both the RS Q8 and the Cullinan have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, lane departure warning systems, blind spot warning systems, around view monitors, rear cross-path warning and available night vision systems.

The RS Q8’s corrosion warranty is 8 years longer than the Cullinan’s (12 vs. 4 years).

There are over 8 times as many Audi dealers as there are Rolls-Royce dealers, which makes it much easier should you ever need service under the RS Q8’s warranty.

The RS Q8’s 4.0 turbo V8 produces 68 more horsepower (631 vs. 563) than the Cullinan’s standard 6.8 turbo V12. The RS Q8’s 4.0 turbo V8 produces 39 more horsepower (631 vs. 592) than the Cullinan Black Badge’s standard 6.8 turbo V12.

On the EPA test cycle the RS Q8 gets better mileage than the Cullinan:

An engine control system that can shut down some of the engine’s cylinders helps improve the RS Q8’s fuel efficiency. The Cullinan doesn’t offer a system that can shut down part of the engine.

Regenerative brakes improve the RS Q8’s fuel efficiency by converting inertia back into energy instead of wasting it. The Cullinan doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the RS Q8’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The Cullinan doesn’t offer an automatic engine start/stop system.

For more complete vehicle control the RS Q8 has a manually controlled automatic, with the available convenience of an automatic transmission and the complete gear control of a manual transmission without the inconvenience of a clutch. A manually controlled automatic allows the driver to eliminate unwanted shifts and maximize engine braking by down shifting while cornering. The Cullinan doesn’t offer a transmission that allows complete gear control.

The RS Q8’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The Cullinan doesn’t offer launch control.

For better stopping power the RS Q8’s front brake rotors are larger than those on the Cullinan:

The RS Q8 has standard heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The Cullinan doesn’t offer ceramic brake rotors.

For better traction, the RS Q8 has larger tires than the Cullinan (295/40R22 vs. 255/45R22). The RS Q8’s tires are larger than the largest tires available on the Cullinan (295/40R22 vs. 255/40R23).

The RS Q8’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the Cullinan’s standard 45 series front tires. The RS Q8’s optional tires have a lower 35 series profile than the Cullinan’s optional 40 series front tires.

The RS Q8 handles at .98 G’s, while the Cullinan pulls only .83 G’s of cornering force in a Car and Driver skidpad test.

The Audi RS Q8 may be more efficient, handle and accelerate better because it weighs about 550 to 800 pounds less than the Rolls-Royce Cullinan.

The RS Q8 is 1 foot, 1.5 inches shorter than the Cullinan, making the RS Q8 easier to handle, maneuver and park in tight spaces.

For excellent aerodynamics, the RS Q8 has standard flush composite headlights. The Cullinan has recessed headlights that spoil its aerodynamic shape and create extra drag.

The RS Q8 has a much larger cargo volume than the Cullinan with its rear seat up (30.5 vs. 19.8 cubic feet).

The RS Q8’s standard rear seats fold to accommodate long and bulky cargo. The Cullinan w/Executive Rear Seats doesn’t offer folding rear seats, only a ski pass-through.

The RS Q8’s liftgate lifts up in one piece, completely out of the way of loading and unloading, while sheltering the cargo loading area. The Cullinan’s tailgate’s top part raises up, but the bottom part lowers, getting in the way of loading and making an uneven surface for sliding cargo.

To make loading groceries and cargo easier when your hands are full, the RS Q8’s liftgate can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The Cullinan doesn’t offer a hands-free gesture to open its tailgate, forcing you to put cargo down if your hands are full.

The RS Q8 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 Cullinan doesn’t offer a remote starting system.

The RS Q8’s front and rear power windows all open or close with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside of the car. The Cullinan’s rear power window switches have to be held the entire time to close them fully.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The RS Q8 has standard headlight washers to keep headlight output high. The Cullinan doesn’t offer headlight washers.

A manual rear sunshade is standard in the RS Q8 and power rear side window sunshades are optional to help block heat and glare for the rear passengers. The Cullinan doesn’t offer a rear sunshade.

The RS Q8’s optional Park Assist Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. Remote Park Assist Plus will park and retrieve your car remotely: press a button and watch it park itself. This is ideal for tight locations. The Cullinan’s automatic parking system does not offer parking by remote control.

The Audi Q8/SQ8/RS Q8 outsold the Rolls-Royce Cullinan by over 11 to one during 2024.