2019 GMC Acadia vs. 2019 Toyota Sienna

Detailed Review, Specifications & Comparison

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Safety

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the Acadia are reminded to check the back seat if they opened the rear door before starting out. The Sienna doesn’t offer a back seat reminder.

The Acadia has a standard front seat center airbag, which deploys between the driver and front passenger, protecting them from injuries caused by striking each other in serious side impacts. The Sienna doesn’t offer front seat center airbags.

The Insurance Institute for Highway Safety tests front crash prevention systems. With a score of 6 points, IIHS rates the Forward Automatic Braking optional in the Acadia as “Superior.” The Sienna scores only 3 points and is rated only “Advanced.”

Both the Acadia and the Sienna have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, front-wheel drive, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available all-wheel drive, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the GMC Acadia is safer than the Toyota Sienna:

 

Acadia

Sienna

OVERALL STARS

5 Stars

4 Stars

 

Driver

STARS

5 Stars

5 Stars

HIC

138

201

Neck Injury Risk

22%

27%

Neck Stress

162 lbs.

260 lbs.

Neck Compression

16 lbs.

50 lbs.

Leg Forces (l/r)

112/392 lbs.

330/307 lbs.

 

Passenger

STARS

4 Stars

4 Stars

HIC

403

413

Neck Stress

152 lbs.

218 lbs.

Leg Forces (l/r)

10/95 lbs.

604/305 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

A significantly tougher test than their original offset frontal crash test, the Insurance Institute for Highway Safety does 40 MPH small overlap frontal offset crash tests. In this test, where only 25% of the total width of the vehicle is struck, results indicate that the GMC Acadia is safer than the Sienna:

 

Acadia

Sienna

Overall Evaluation

GOOD

ACCEPTABLE

Restraints

GOOD

ACCEPTABLE

Head Neck Evaluation

GOOD

GOOD

Peak Head Forces

0 G’s

0 G’s

Steering Column Movement Rearward

0 cm

5 cm

Chest Evaluation

GOOD

GOOD

Max Chest Compression

19 cm

24 cm

Hip & Thigh Evaluation

GOOD

GOOD

Femur Force R/L

.2/.1 kN

4.3/.9 kN

Hip & Thigh Injury Risk R/L

0%/0%

2%/0%

Lower Leg Evaluation

GOOD

GOOD

Tibia forces R/L

.9/.9 kN

1.1/2.4 kN

The National Highway Traffic Safety Administration does side impact tests on new vehicles. In this test, which crashes the vehicle into a flat barrier at 38.5 MPH and into a post at 20 MPH, results indicate that the GMC Acadia is safer than the Toyota Sienna:

 

Acadia

Sienna

 

Front Seat

STARS

5 Stars

5 Stars

Hip Force

253 lbs.

391 lbs.

 

Rear Seat

STARS

5 Stars

5 Stars

Spine Acceleration

42 G’s

52 G’s

 

Into Pole

STARS

5 Stars

5 Stars

Max Damage Depth

14 inches

17 inches

HIC

319

404

Spine Acceleration

33 G’s

33 G’s

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, and with its optional front crash prevention system, the Insurance Institute for Highway Safety grants the Acadia the rating of “Top Pick” for 2017, a rating granted to only 154 vehicles tested by the IIHS. The Sienna was not even a “Top Pick” for 2016.

Warranty

The Acadia’s corrosion warranty is 1 year longer than the Sienna’s (6 vs. 5 years).

There are over 38 percent more GMC dealers than there are Toyota dealers, which makes it easier should you ever need service under the Acadia’s warranty.

Reliability

To reliably start during all conditions and help handle large electrical loads, the Acadia has a standard 660-amp battery. The Sienna’s 582-amp battery isn’t as powerful.

Engine

The Acadia’s optional 3.6 DOHC V6 produces 14 more horsepower (310 vs. 296) and 8 lbs.-ft. more torque (271 vs. 263) than the Sienna’s 3.5 DOHC V6.

As tested in Car and Driver the GMC Acadia V6 is faster than the Toyota Sienna:

 

Acadia

Sienna

Zero to 30 MPH

2.2 sec

2.5 sec

Zero to 60 MPH

6.1 sec

6.9 sec

Zero to 100 MPH

17.2 sec

18.1 sec

5 to 60 MPH Rolling Start

6.4 sec

7.1 sec

Passing 30 to 50 MPH

3.3 sec

3.7 sec

Passing 50 to 70 MPH

4.8 sec

5.2 sec

Quarter Mile

15 sec

15.4 sec

Speed in 1/4 Mile

94 MPH

93 MPH

Top Speed

131 MPH

112 MPH

Fuel Economy and Range

In heavy traffic or at stoplights the Acadia 4 cyl.’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. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The Sienna doesn’t offer an automatic engine start/stop system.

The Acadia AWD’s standard fuel tank has 1.7 gallons more fuel capacity than the Sienna (21.7 vs. 20 gallons).

The Acadia has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The Sienna doesn’t offer a cap-less fueling system.

Brakes and Stopping

The Acadia’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the Sienna are solid, not vented.

The Acadia stops shorter than the Sienna:

 

Acadia

Sienna

 

70 to 0 MPH

173 feet

181 feet

Car and Driver

60 to 0 MPH

126 feet

128 feet

Motor Trend

Tires and Wheels

For better traction, the Acadia’s optional tires are larger than the largest tires available on the Sienna (255/65R17 vs. 235/60R17).

For better ride, handling and brake cooling the Acadia offers optional 20-inch wheels. The Sienna’s largest wheels are only 19-inches.

The GMC Acadia’s wheels have 6 lugs for longer wheel bearing life, less chance of rotor warping and greater strength. The Toyota Sienna only has 5 wheel lugs per wheel.

The Acadia has a standard easy tire fill system. When inflating the tires, the vehicle’s integrated tire pressure sensors keep track of the pressure as the tires fill and tell the driver when the tires are inflated to the proper pressure. The Sienna doesn’t offer vehicle monitored tire inflation.

Suspension and Handling

For superior ride and handling, the GMC Acadia has fully independent front and rear suspensions. An independent suspension allows the wheels to follow the road at the best angle for gripping the pavement, without compromising ride comfort. The Toyota Sienna has a rear torsion beam axle, with a semi-independent rear suspension.

The Acadia offers an available driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads or off-road. The Sienna’s suspension doesn’t offer adjustable shock absorbers.

The Acadia has variable-assist power steering, for low-effort parking, better control at highway speeds and during hard cornering, and a better feel of the road. The Sienna doesn’t offer variable-assist power steering.

For greater off-road capability the Acadia has a greater minimum ground clearance than the Sienna (7.2 vs. 6.6 inches), allowing the Acadia to travel over rougher terrain without being stopped or damaged. The Acadia All Terrain’s minimum ground clearance is 1.2 inches higher than on the Sienna (7.8 vs. 6.6 inches).

Chassis

The GMC Acadia may be more efficient, handle and accelerate better because it weighs about 350 to 450 pounds less than the Toyota Sienna.

The Acadia is 6.7 inches shorter than the Sienna SE, making the Acadia easier to handle, maneuver and park in tight spaces. The Acadia is 7 inches shorter than the Sienna.

The front grille of the Acadia FWD 4 cyl. uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The Sienna doesn’t offer active grille shutters.

The Acadia uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The Sienna doesn’t offer active noise cancellation.

Passenger Space

The Acadia has .5 inches more front legroom and 2.1 inches more rear legroom than the Sienna.

Cargo Capacity

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

Towing

Maximum trailer towing in the Toyota Sienna is limited to 3500 pounds. The Acadia offers up to a 4000 lbs. towing capacity.

Servicing Ease

The Acadia uses gas struts to support the hood for easier service access. The Sienna uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.

Ergonomics

The Acadia’s speed-sensitive wipers speed up when the vehicle does, so that the driver doesn’t have to continually adjust the speed of the wipers. The Sienna’s standard manually variable intermittent wipers have to be constantly adjusted.

The Acadia’s standard outside mirrors include heating elements to clear off the mirrors for better visibility. The Sienna L doesn’t offer heated side mirrors.

Both the Acadia and the Sienna offer available heated front seats. The Acadia also offers optional heated second row seats to keep those passengers extremely comfortable in the winter. Heated second row seats aren’t available in the Sienna.

Standard air-conditioned seats in the Acadia Denali keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The Sienna doesn’t offer air-conditioned seats.

Economic Advantages

According to The Car Book by Jack Gillis, the Acadia is less expensive to operate than the Sienna because typical repairs cost much less on the Acadia than the Sienna, including $72 less for a water pump, $148 less for a starter, $114 less for fuel injection, $157 less for a fuel pump and $217 less for a timing belt/chain.

Recommendations

The GMC Acadia outsold the Toyota Sienna by 949 units during 2018.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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