2020 Toyota Sienna vs. 2019 GMC Acadia

Detailed Review, Specifications & Comparison

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Safety

For enhanced safety, the front and middle seat shoulder belts of the Toyota Sienna are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The GMC Acadia doesn’t offer height-adjustable front seat belts.

The Sienna has standard Active Headrests, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Headrests system moves the headrests forward to prevent neck and spine injuries. The Acadia doesn’t offer a whiplash protection system.

Both the Sienna and the Acadia 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, 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 Toyota Sienna is safer than the GMC Acadia:

Sienna

Acadia

Passenger

STARS

4 Stars

4 Stars

Chest Compression

.3 inches

.6 inches

Neck Injury Risk

35%

37%

Neck Compression

80 lbs.

186 lbs.

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

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 Toyota Sienna is safer than the GMC Acadia:

Sienna

Acadia

Front Seat

STARS

5 Stars

5 Stars

HIC

49

106

Chest Movement

.6 inches

.9 inches

Abdominal Force

144 G’s

155 G’s

Rear Seat

STARS

5 Stars

5 Stars

HIC

143

263

Hip Force

746 lbs.

896 lbs.

Into Pole

STARS

5 Stars

5 Stars

Hip Force

586 lbs.

673 lbs.

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

Warranty

The Sienna’s corrosion warranty is unlimited miles longer than the Acadia’s (unlimited vs. 100,000 miles).

Toyota pays for scheduled maintenance on the Sienna for 2 years and 25000 miles. Toyota will pay for oil changes, lubrication and any other required maintenance. GMC only pays for the first scheduled maintenance visit on the Acadia.

Reliability

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the Sienna’s reliability 44 points higher than the Acadia.

J.D. Power and Associates rated the Sienna third among minivans in their 2019 Initial Quality Study. The Acadia isn’t in the top three in its category.

J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Toyota vehicles are better in initial quality than GMC vehicles. J.D. Power ranks Toyota 8th in initial quality, above the industry average. With 4 more problems per 100 vehicles, GMC is ranked 12th, below the industry average.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Toyota vehicles are more reliable than GMC vehicles. J.D. Power ranks Toyota second in reliability, above the industry average. With 53 more problems per 100 vehicles, GMC is ranked 22nd.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Toyota vehicles are more reliable than GMC vehicles. Consumer Reports ranks Toyota second in reliability. GMC is ranked 25th.

Engine

The Sienna’s 3.5 DOHC V6 produces 103 more horsepower (296 vs. 193) and 75 lbs.-ft. more torque (263 vs. 188) than the Acadia’s standard 2.5 DOHC 4 cyl.

Fuel Economy and Range

On the EPA test cycle the Sienna FWD gets better fuel mileage than the Acadia FWD V6 (19 city/26 hwy vs. 18 city/25 hwy).

Transmission

An eight-speed automatic is standard on the Toyota Sienna, for better acceleration and lower engine speed on the highway. Only a six-speed automatic is available for the Acadia.

Brakes and Stopping

For better stopping power the Sienna’s front brake rotors are larger than those on the Acadia:

Sienna

Acadia

Front Rotors

12.9 inches

12.6 inches

The Sienna stops shorter than the Acadia:

Sienna

Acadia

60 to 0 MPH

121 feet

126 feet

Motor Trend

Tires and Wheels

The Sienna L/LE/XLE’s standard tires provide better handling because they have a lower 60 series profile (height to width ratio) that provides a stiffer sidewall than the Acadia’s standard 65 series tires. The Sienna SE’s tires have a lower 50 series profile than the Acadia’s optional 55 series tires.

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 Acadia doesn’t offer run-flat tires.

Suspension and Handling

For a smoother ride and more stable handling, the Sienna’s wheelbase is 6.8 inches longer than on the Acadia (119.3 inches vs. 112.5 inches).

For better handling and stability, the track (width between the wheels) on the Sienna is 3.2 inches wider in the front and 3.2 inches wider in the rear than on the Acadia.

For better maneuverability, the Sienna AWD’s turning circle is 1.3 feet tighter than the Acadia’s (37.4 feet vs. 38.7 feet). The Sienna’s turning circle is 1.2 feet tighter than the Acadia’s (37.5 feet vs. 38.7 feet).

Passenger Space

The Sienna offers optional seating for 8 passengers; the Acadia can only carry 7.

The Sienna has 20.6 cubic feet more passenger volume than the Acadia (164.4 vs. 143.8).

The Sienna has .7 inches more front headroom, 2.9 inches more front hip room, 5.6 inches more front shoulder room, .1 inches more rear headroom, 12.8 inches more rear hip room, 5.9 inches more rear shoulder room, 1.1 inches more third row headroom, 5.2 inches more third row legroom, 7.4 inches more third row hip room and 6.8 inches more third row shoulder room than the Acadia.

For enhanced passenger comfort on long trips the Sienna’s middle and third row seats recline. The Acadia’s third row seats don’t recline.

The front step up height for the Sienna is 1.3 inches lower than the Acadia (16.7” vs. 18”).

Cargo Capacity

The Sienna’s cargo area provides more volume than the Acadia.

Sienna

Acadia

Behind Third Seat

39.1 cubic feet

12.8 cubic feet

Third Seat Folded

n/a

41.7 cubic feet

Third Seat Removed

87.1 cubic feet

n/a

Second Seat Folded

117.8 cubic feet

79 cubic feet

Max Cargo Volume

150 cubic feet

79 cubic feet

A low lift-over cargo hatch design makes loading and unloading the Sienna easier. The Sienna’s cargo hatch lift-over height is 23.6 inches, while the Acadia’s liftover is 32 inches.

The Sienna’s cargo area is larger than the Acadia’s in almost every dimension:

Sienna

Acadia

Length to seat (3rd/2nd/1st)

23.5”/54”/74”

18.5”/48”/83”

Max Width

51.5”

50”

Min Width

47.5”

42.5”

Height

45”

33”

The Sienna has a standard Split & Stow 3rd Row third row seat, which folds flat into the floor. This completely clears a very large cargo area quickly. The Acadia doesn’t offer seats that fold into the floor.

A standard locking glovebox (which can’t be accessed with the valet key) keeps your small valuables safer in the Sienna. The Acadia doesn’t offer locking storage for small valuables.

Towing

The Sienna’s standard towing capacity is much higher than the Acadia’s (3500 vs. 1000 pounds).

Ergonomics

The Sienna’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Acadia’s standard power window switches have to be held the entire time to close them fully. Only its front windows open automatically. The Acadia’s optional windows’ passenger windows don’t close automatically.

The Sienna has a standard locking fuel door with a remote release located convenient to the driver. A locking fuel door helps prevent vandalism, such as sugar in the tank and fuel theft. The Acadia doesn’t offer a locking fuel door.

The Sienna Limited Premium’s standard wipers adjust their speed and turn on and off automatically according to the amount of rainfall on the windshield. The Acadia’s intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.

Economic Advantages

Insurance will cost less for the Sienna owner. The Complete Car Cost Guide estimates that insurance for the Sienna will cost $395 less than the Acadia over a five-year period.

According to The Car Book by Jack Gillis, the Sienna is less expensive to operate than the Acadia because it costs $91 less to do the manufacturer’s suggested maintenance for 50,000 miles. Typical repairs cost much less on the Sienna than the Acadia, including $69 less for a muffler, $128 less for front brake pads, $3 less for front struts and $610 less for a power steering pump.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Toyota Sienna will be $220 to $1179 less than for the GMC Acadia.

Recommendations

Consumer Reports® recommends the Toyota Sienna, based on reliability, safety and performance.

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

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