2017 Mercedes-Benz GLS450 getting power with 3 liter dual turbocharged V-6 to produce 362 horsepower at 6000 revs. and 369 lb-ft of torque at 1600 rpm paired with nine speed automatic transmission. Clocking 5.7 seconds to touch 60 mph from zero, EPA likely to remain 17/22 mpg city/highway rating. Coming with new 9G Tronic transmission where first seven gears sport shorter ratios than in old transmission. 2017 GLS450 is lighter by 207 pounds than 2015 GLS450. Two extra gears taller than seventh gear in old transmission provides better EPA rating. 9G Tronic behaves perfect even in Comfort mode, while in Sport mode seems eager in throttle booting. Touchpad controller operates with finger swipes and tapping like smartphone with COMAND infotainment display, COMAND menus along with knobs, steering wheels controls, voice commands.
7 passengers can seat in comfort, third row for children, suspension is felt dull on rough road while air springs are standard, weighing 5400 pounds and 72.8 inches tall, consumes 186 feet to stop from 70 mph which is ok enough for this segment. Steering seems deprive of feelings and slow to driver inputs while on highway tracks well, even brakes works in similar way. Cargo upto 94 cubic feet with second and third row folded.
Some addons temperature controlled cup holders($180), illuminated running boards($670), heated steering wheel($250), trailer hitch($575), power flipping second row seats($400), for $3830 you have Apple CarPlay, a proximity key, SiriusXM satellite radio, ambient interior light, power passenger seats and lane keep assist. Park Assist package($1290) includes surround view camera and self parking system. Iridium Silver paint($720), Anthracite Poplar wood trim($160).
GLS450 is more like Volvo XC90 and Audi Q7, while closer to Cadillac Escalade four wheel drive but GLS450 with better cargo and fuel efficiency will make it mark. If you look for seven seater comfort and 7500 pound tow rating you need to go for GLS450 else Volvo XC90 and Audi Q7 remains a better choice.