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For better traction, the Sienna has larger tires than the Metris Passenger (235/60R17 vs. 225/55R17).
The Sienna SE’s tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the Metris Passenger’s 55 series tires.
For better load carrying, ride, handling and brake cooling the Sienna SE has standard 19-inch wheels. The Metris Passenger’s largest wheels are only 17-inches.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the Sienna can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Metris Passenger doesn’t offer run-flat tires.
The Sienna has standard front and rear stabilizer bars, which help keep the Sienna flat and controlled during cornering. The Metris Passenger’s suspension doesn’t offer a rear stabilizer bar.
The Toyota Sienna may be more efficient, handle and accelerate better because it weighs about 100 to 400 pounds less than the Mercedes Metris Passenger.
The Sienna has 1.4 inches more front headroom, 4.7 inches more front legroom, 2.8 inches more front shoulder room, 1.8 inches more rear legroom, .6 inches more rear hip room and .5 inches more third row legroom than the Metris Passenger.
For enhanced passenger comfort on long trips the Sienna’s middle and third row seats recline. The Metris Passenger’s middle and third row seats don’t recline.
The Sienna’s cargo area provides more volume than the Metris Passenger.
Behind Third Seat
39.1 cubic feet
38 cubic feet
The Sienna’s available rear seats fold to accommodate long and bulky cargo. The Metris Passenger doesn’t offer folding rear seats.
To make loading and unloading groceries and cargo easier, especially for short adults, the Sienna (except L) offers an optional power liftgate, which opens and closes automatically by pressing a button. The Metris Passenger doesn’t offer a power liftgate.
The Sienna (except Base/SE/LE) offers a 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 Metris Passenger doesn’t offer a remote starting system.
To help each driver find a more comfortable driving position, the Sienna has a telescoping steering wheel. Much better than just a tilt steering wheel or adjustable seat, this allows a short driver to sit further from the steering wheel while maintaining contact with the pedals. The Metris Passenger doesn’t offer a telescoping steering wheel.
When two different drivers share the Sienna Limited, the memory seats and mirrors make it convenient for both. Each setting activates different, customized memories for the driver’s seat position and outside mirror angle. The Metris Passenger doesn’t offer a memory system.
The Sienna Limited’s standard easy entry system glides the driver’s seat back when the door is unlocked or the ignition is switched off, making it easier for the driver to get in and out. The Metris Passenger doesn’t offer an easy entry system.
The Sienna’s standard power windows have a locking feature to keep children from operating them, but the driver can still raise and lower all of them with the lock engaged. Mercedes does not offer a locking feature on the Metris Passenger’s standard power windows.
The Smart Key System optional on the Sienna (except L) allows you to unlock the doors, cargo door and start the engine all without removing a key from pocket or purse. This eliminates searching for keys before loading groceries, getting in the vehicle in bad weather or making a hurried start to your trip. The Mercedes Metris Passenger doesn’t offer an advanced key system.
To improve rear visibility by keeping the rear window clear, the Sienna has a standard rear wiper. A rear wiper costs extra on the Metris Passenger.
While driving with high beams on, sensitive light sensors standard on the Sienna detect other vehicles which could be blinded and automatically switch to low beams. The Metris Passenger doesn’t offer automatic dimming high beams.
The Sienna has standard power remote mirrors. The Metris Passenger only comes with remote mirrors at extra cost. Without them the driver will have to roll down the windows and reach across the car to adjust the mirrors.
When the Sienna Limited is put in reverse, both rearview mirrors tilt from their original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirrors into their original positions. The Metris Passenger’s mirrors don’t automatically adjust for backing.
The Sienna LE/SE/XLE/Limited’s standard rear and side view mirrors have an automatic dimming feature. These mirrors can be set to automatically darken quickly when headlights shine on them, keeping following vehicles from blinding or distracting the driver. The Metris Passenger doesn’t offer the luxury of automatic dimming mirrors.
On extremely cold winter days, the Sienna Limited’s standard heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the vehicle heater warms up. The Metris Passenger doesn’t offer a heated steering wheel.
The Sienna has a standard center folding armrest for the middle row passengers. A center armrest helps make middle row passengers more comfortable. The Metris Passenger doesn’t offer a middle row seat center armrest.
The Sienna has a standard dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. Dual zone air conditioning costs extra on the Metris Passenger.
To keep a safe, consistent following distance, the Sienna has a standard Dynamic Radar Cruise Control, which alters the speed of the vehicle without driver intervention. This allows the driver to use cruise control more safely without constantly having to disengage it when approaching slower traffic. The Metris Passenger doesn’t offer an adaptive cruise control.
To direct the driver from any location to a given street address, a GPS navigation system is available on the Sienna. The Sienna’s navigation system also has a real-time traffic update feature that offers alternative routes to automatically bypass traffic problems. (Service not available in all areas.) The Metris Passenger doesn’t offer a navigation system.
The Sienna Premium has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Metris Passenger doesn’t offer a house-current electrical outlet.
Consumer Reports? recommends the Toyota Sienna, based on reliability, safety and performance.
The Toyota Sienna outsold the Mercedes Metris by over 10 to one during 2018.
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