Sixt is known for offering a wide selection of high-end vehicles, each designed to deliver a refined and capable driving experience. Whether you’re looking for a luxury sedan or a premium SUV, the fleet includes a variety of models to suit different preferences and travel needs.
For those looking for something more exclusive, the Sixt XFAN category deserves attention. Although it currently includes only one model, this vehicle combines strong performance with a bold appearance, offering a rental experience that stands apart from more common options.
Sixt XFAN
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Mercedes Benz G550 Automatic
Few vehicles have held onto their identity quite like the Mercedes-Benz G550. Since its debut in the late 1970s, the G-Class has stayed true to its rugged, boxy design and body-on-frame construction. Over the years, it has been continuously updated with modern technology and refinement, yet its core character remains intact. In the United States, the G550 continues to stand out in the premium rental lineup at Sixt, offering one of the most capable and distinctive driving experiences available.
In the current generation, Mercedes-Benz has introduced a major update under the hood. The previous 4.0-liter twin-turbo V8 has been replaced by a 3.0-liter turbocharged inline-six engine, now paired with a 48-volt mild hybrid system. This setup produces 443 horsepower and 413 lb-ft of torque. Under certain conditions, the integrated starter-generator contributes an additional 20 horsepower and up to 147 lb-ft of torque, enhancing acceleration and low-speed smoothness.
Power is managed through a 9-speed automatic transmission that delivers smooth and responsive shifts. As with previous models, the G550 is equipped with a full-time four-wheel-drive system, a low-range transfer case, and three manually lockable differentials. The vehicle accelerates from 0 to 60 mph in approximately 5.3 seconds, a notable result considering its weight and upright proportions.
On the road, the G550 feels remarkably stable and composed for a vehicle of its size. The revised suspension, now featuring adaptive dampers, helps to smooth out imperfections and reduce body movement at higher speeds. Steering response has also been refined and offers improved feedback and precision compared to earlier versions.
Off the pavement, the G-Class continues to demonstrate its well-known capabilities. It handles steep inclines, uneven surfaces, and water crossings up to 27.6 inches in depth with confidence. Two new features enhance its off-road utility. The G-Turn system allows the vehicle to rotate within a tight radius on loose terrain, and the Transparent Hood function uses front-mounted cameras to project a view of the ground beneath the vehicle onto the central display. These systems improve visibility and control in challenging conditions. However, renters should note that the use of certain off-road features may be limited by rental agreements and should always review the terms before attempting technical terrain.
Inside, the G550 has been subtly refined to meet the expectations of a modern luxury SUV. High-quality materials are used throughout the cabin. Available finishes include Nappa leather upholstery, open-pore wood trim, and aluminum accents. The front seats are power-adjustable and heated as standard, with options for ventilation and massage functionality for added comfort.
The interior features a new curved widescreen display that combines a 12.3-inch digital instrument cluster with a matching 12.3-inch central touchscreen. The system runs the latest version of Mercedes-Benz’s MBUX infotainment platform and supports input via touch, voice command, or the center touchpad. Standard technology includes wireless Apple CarPlay, Android Auto, multiple USB-C ports, and wireless smartphone charging.
Rear passengers enjoy a high seating position with ample space, and optional comfort features such as heated seats and a separate climate control zone. Interior acoustics have been improved with enhanced insulation, and redesigned exterior mirrors help minimize wind noise at highway speeds.
The G550 includes a comprehensive suite of driver assistance features. Standard systems include automatic emergency braking, blind spot monitoring with exit warning, lane keeping assist, traffic sign recognition, and a rearview camera with semi-automated parking support. Optional equipment includes a 360-degree surround-view camera with off-road functionality, a head-up display, and adaptive cruise control with stop-and-go capability.
Despite its upright stance and rear-mounted spare tire, the G-Class offers good everyday usability. With the rear seats in place, the cargo area provides 38.1 cubic feet of space. Folding the second row expands capacity to 68.6 cubic feet. The side-hinged tailgate opens wide, although some clearance is needed in tighter spaces.
Towing capacity is rated at 7,000 pounds, making the G550 suitable for heavy trailers, boats, or recreational equipment. Many Sixt rental vehicles in this category are already equipped with a factory-installed trailer hitch.
Fuel efficiency has seen a modest improvement with the mild hybrid system. According to EPA estimates, the G550 achieves a combined average of 18 miles per gallon, with 16 mpg in the city and 20 mpg on the highway. While it remains a traditional gasoline-powered SUV at heart, the added efficiency makes it a more balanced option within the luxury off-road segment.