Compare the2024 Toyota SiennaVS 2023 GMC Acadia

Safety
Warranty
Reliability
Engine
Fuel Economy and Range
Environmental Friendliness
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Passenger Space
Cargo Capacity
Towing
Ergonomics
Economic Advantages
Recommendations

Safety

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The Sienna has a standard Secondary Collision Brake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Acadia doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

Over 200 people are killed each year when backed over by motor vehicles. The Sienna XLE/XSE/Limited/Platinum has a standard Parking Support Brake that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The Acadia doesn’t offer backup collision prevention brakes.

Both the Sienna and Acadia have Rear Cross Traffic Alert, but the Sienna has Rear Cross Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The Acadia’s Rear Cross Traffic Alert doesn’t automatically brake.

The Sienna’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The Acadia doesn’t offer a driver alert monitor.

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, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning, available all wheel drive and around view monitors.

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
HIC	175	319
Chest Compression	.6 inches	.6 inches
Neck Stress	200 lbs.	203 lbs.
Neck Compression	42 lbs.	99 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	42	125
Chest Movement	.5 inches	.9 inches
Abdominal Force	123 lbs.	156 lbs.
	Rear Seat
STARS	5 Stars	5 Stars
HIC	52	276
Spine Acceleration	30 G’s	51 G’s
Hip Force	542 lbs.	799 lbs.
	Into Pole
STARS	5 Stars	5 Stars
Max Damage Depth	12 inches	14 inches
HIC	371	381
Spine Acceleration	31 G’s	36 G’s
Hip Force	499 lbs.	760 lbs.

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

Instrumented handling tests conducted by the National Highway Traffic Safety Administration and analysis of its dimensions indicate that the Sienna is 1.1% to 3.7% less likely to roll over than the Acadia.

The Toyota Sienna achieved a “Top Safety Pick” rating from the Insurance Institute for Highway Safety (IIHS) for the 2024 model year. This recognition was based on its impressive performance in the small overlap frontal crash test, updated side impact crash test, headlight evaluations, and pedestrian crash prevention testing. The Acadia is not a “Top Safety Pick” for 2024.

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, tire rotations, air filter replacements, cabin filter replacement, brake fluid replacement, inspections, and any other required maintenance. GMC only pays for the first scheduled maintenance visit on the Acadia.

Reliability

The battery on the Sienna is in the trunk, which protects it from hot underhood temperatures that can degrade battery life. By keeping the Sienna’s battery 20 to 30 degrees cooler, its life is increased by years. The Acadia’s battery is in the hot engine compartment.

J.D. Power and Associates’ 2022 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 above average in long-term dependability. With 34 more problems per 100 vehicles in the first three years of ownership, GMC is rated lower.

From surveys of all its subscribers, Consumer Reports’ January 2024 Auto Issue reports that Toyota vehicles are more reliable than GMC vehicles. Consumer Reports ranks Toyota second in overall reliability. GMC is ranked 24th.

Engine

The Sienna’s 2.5 DOHC 4-cylinder hybrid produces 17 more horsepower (245 vs. 228) than the Acadia’s standard 2.0 turbo 4-cylinder.

Fuel Economy and Range

On the EPA test cycle the Sienna gets better mileage than the Acadia:

			MPG
Sienna
	FWD	2.5 4-cyl. Hybrid	36 city/36 hwy
	AWD	2.5 4-cyl. Hybrid	35 city/36 hwy
Acadia
	FWD	3.6 DOHC V6	19 city/27 hwy
		2.0 turbo 4-cyl.	22 city/29 hwy
	AWD	3.6 DOHC V6	19 city/26 hwy
		2.0 turbo 4-cyl.	22 city/27 hwy

To lower fuel costs and make buying fuel easier, the Toyota Sienna uses regular unleaded gasoline. The Acadia with the 2.0 turbo 4-cylinder engine requires premium for maximum efficiency, which can cost on average about 82.8 cents more per gallon.

The Sienna has a standard locking fuel door with a power remote release convenient to the driver. The fuel filler door is not lockable on the Acadia. A locking fuel door helps prevent fuel theft and vandalism, such as sugar in the tank.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Toyota Sienna higher (7 out of 10) than the GMC Acadia (6 to 7). This means the Sienna produces up to 1.1 pounds less smog-producing pollutants than the Acadia every 15,000 miles.

Transmission

The Sienna has a standard continuously variable transmission (CVT). With no “steps” between gears, it can keep the engine at the most efficient speed for fuel economy, or keep it at its peak horsepower indefinitely for maximum acceleration. The Acadia doesn’t offer a CVT.

Brakes and Stopping

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

	Sienna	Acadia
Front Rotors	12.9 inches	12.6 inches
Rear Rotors	12.5 inches	12.4 inches

The Sienna stops shorter than the Acadia:

	Sienna	Acadia
60 to 0 MPH	125 feet	126 feet	Motor Trend

Tires and Wheels

The Sienna XSE/FWD Platinum’s tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the Acadia’s optional 55 series tires.

Suspension and Handling

For a smoother ride and more stable handling, the Sienna’s wheelbase is 8 inches longer than on the Acadia (120.5 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 4 inches wider in the rear than on the Acadia.

The Sienna’s front to rear weight distribution is more even (53% to 47%) than the Acadia’s (56.5% to 43.5%). This gives the Sienna more stable handling and braking.

Passenger Space

The Sienna has standard seating for 8 passengers; the Acadia can only carry up to 7.

The Sienna has 18.7 cubic feet more passenger volume than the Acadia (162.5 vs. 143.8).

The Sienna has .1 inches more front headroom, 3.9 inches more front hip room, 3 inches more front shoulder room, .3 inches more rear headroom, .2 inches more rear legroom, 12.9 inches more rear hip room, 4 inches more rear shoulder room, .2 inches more third row headroom, 9 inches more third row legroom, 5.9 inches more third row hip room and 4.2 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.

Cargo Capacity

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

	Sienna	Acadia
Behind Third Seat	33.5 cubic feet	12.8 cubic feet
Third Seat Folded	75.2 cubic feet	41.7 cubic feet
Second Seat Folded	101 cubic feet	79 cubic feet

The Sienna has a standard Split & Stow 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).

Standard Trailer Sway Control on the Sienna uses the Enhanced Vehicle Stability Control sensors to detect trailer sway, then uses individual brakes to counteract any swaying and help keep the tow vehicle and trailer steady. The Acadia doesn’t offer electronic trailer sway control.

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 rear power window switches have to be held the entire time to open them fully. Only its driver’s window closes automatically.

If the windows are left open on the Sienna the driver can close them all at the outside door handle. On a hot day the driver can lower the windows at the outside door handle or from a distance using the keyless remote. (This window function must be activated by your Toyota service department.) The driver of the Acadia can only operate the windows from inside the vehicle, with the ignition on.

The Sienna Platinum’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.

The Insurance Institute for Highway Safety (IIHS) conducts detailed tests on headlights for their range both straight ahead and in curves and to be certain they don’t exceed acceptable amounts of glare to oncoming drivers. The Sienna’s headlights were rated “Good” by the IIHS, while the Acadia’s headlights are rated “Marginal.”

Economic Advantages

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Toyota Sienna will be $206 to $2994 less than for the GMC Acadia.

Recommendations

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

The Toyota Sienna outsold the GMC Acadia by 225 units during 2023.