Mercedes gl450 2020

Safety and Driver-Assistance Features

Neither the National Highway Traffic Safety Administration (NHTSA) nor the Insurance Institute for Highway Safety (IIHS) have released crash-test results for the 2020 GLS-class. Mercedes-Benz offers several different types of driver-assistance features on the GLS-class, but the most interesting bits—such as a semi-autonomous driving mode—are optional extras. Key safety features include:

  • Standard automated emergency braking with pedestrian detection
  • Available lane-departure warning with lane-keeping assist
  • Available adaptive cruise control with semi-autonomous driving mode

Pricing and Which One to Buy

  • GLS450: $76,945
  • GLS580: $99,795

The GLS450’s turbocharged inline-six provides plenty of power and is just as smooth-running as the GLS580’s V-8, so we’d stick with that and instead spend money on worthy options. The Executive Rear Seat Plus package turns the second row into a more luxurious zone with heated and ventilated seats with massage, a wireless smartphone charging pad, a tablet controller for the GLS’s infotainment system, plusher head rests, and side-impact airbags. Ordering that package necessitates adding leather upholstery. (Believe it or not, leather isn’t standard even at these prices.) The Convenience package is worthy too, as it adds four-zone automatic climate control, ventilated front seats, and power rear-window sunshades. The GLS450’s standard 19-inch wheels look a little wimpy in contrast to its large body, so we’d suggest one of the larger 20- or 21-inch options.

Warranty and Maintenance Coverage

Buyers of the GLS-class receive a four-year/50,000 mile warranty as standard, which is far from the best in this class. The Cadillac Escalade offers two more years of powertrain warranty coverage and the Lincoln Navigator comes with four years of complimentary scheduled maintenance if you go for the luxurious Black Label model.

  • Limited warranty covers 4 years or 50,000 miles
  • Powertrain warranty covers 4 years or 50,000 miles
  • No complimentary scheduled maintenance

Specifications

Specifications

2020 Mercedes-Benz GLS450

VEHICLE TYPE
front-engine, all-wheel-drive, 6-passenger, 4-door wagon

PRICE AS TESTED
$96,835 (base price: $76,195)

POWERTRAIN
turbocharged and intercooled DOHC 24-valve 3.0-liter inline-6, 362 hp, 369 lb-ft + AC motor, 21 hp, 184 lb-ft (combined system 362 hp, 369 lb-ft; 0.9-kWh lithium-ion battery)

TRANSMISSION
9-speed automatic

CHASSIS
Suspension (F/R): control arms/multilink
Brakes (F/R): 14.8-in vented, cross-drilled disc/13.6-in vented disc
Tires: Pirelli P Zero PZ4 PNCS, F: 275/45R-21 107Y MO-S R: 315/40R-21 111Y MO-S

DIMENSIONS
Wheelbase: 123.4 in
Length: 205.0 in
Width: 77.0 in
Height: 71.8 in
Cargo volume: 17 cu ft
Curb weight: 5594 lb

C/DTEST RESULTS
Rollout, 1 ft: 0.3 sec
60 mph: 5.5 sec
100 mph: 14.4 sec
120 mph: 22.6 sec
Rolling start, 5–60 mph: 6.2 sec
Top gear, 30–50 mph: 3.4 sec
Top gear, 50–70 mph: 4.5 sec
¼-mile: 14.1 sec @ 99 mph
Top speed (governor limited): 129 mph
Braking, 70–0 mph: 154 ft
Roadholding, 300-ft-dia skidpad: 0.92 gC/DFUEL ECONOMY
Observed: 17 mpg
75-mph highway driving: 24 mpg
Highway range: 570 miles

EPA FUEL ECONOMY
Combined/city/highway: 21/19/23 mpg

Fuel Economy and Real-World MPG

The EPA’s fuel economy estimates for the GLS-class don’t paint a pretty picture; the GLS450 earns ratings of 19 mpg city, 23 mpg highway, and 21 mpg combined while the GLS580 earned 16 mpg, 21 mpg, and 18 mpg respectively. In the real world, things appear to be a little better than expected, at least for the GLS450, which managed 24 mpg in our 200-mile highway fuel economy test. The GLS580 returned a dismal 18 mpg in the same test. When it comes to fuel efficiency though, the rival BMW X7 SUV is simply more efficient; a six-cylinder X7 xDrive40i test vehicle managed an impressive 28 mpg in our highway test while an eight-cylinder xDrive50i delivered a 24 mpg result.

Engine, Transmission, and Performance

Two models are offered—the six-cylinder GLS450 and the eight-cylinder GLS580—and both feature electric-assist hybrid powertrains. The GLS450’s turbocharged 3.0-liter inline-six is silky smooth and good for 362 horsepower when combined with its electric motor; the GLS580 is far more powerful, making 483 horsepower from its twin-turbocharged 4.0-liter V-8 and electric motor. Despite its size, the GLS-class is easy to hustle on a twisty road but its ride avoids being overly sporty or harsh over bumps. All GLS models come standard with air suspension, but Mercedes also offers a trick new system called E-Active Body Control. It utilizes a forward-facing camera to scan for bumps and supposedly adjusts the suspension to better damp out road imperfections. It’s cool but expensive, and we think most buyers will find the standard setup plenty smooth enough.

Marc Urbano

Overview

The spacious and indisputably luxurious GLS-class sits atop the Mercedes-Benz SUV hierarchy. Compared to the bold and boxy G-wagen that it shares a showroom with, the GLS is far more elegant, with design cues similar to the smaller GLE-class SUV’s. The cabin is decked out in fine materials and heavy with tech—including a wall of screens serving as the gauge cluster and infotainment display. The two available powertrains are hybrids—unfortunately, neither delivers particularly impressive fuel economy—and all-wheel drive is standard with both. While the GLS-class will likely find homes with wealthy suburban families who won’t dare tackle more than the occasional dirt road, Mercedes has engineered its largest SUV with actual off-road capability, including an adjustable air suspension for extra ground clearance.

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