Compare the2025 Mazda 3VS 2025 Honda Civic Si

Safety
Reliability
Engine
Fuel Economy and Range
Environmental Friendliness
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Chassis
Passenger Space
Cargo Capacity
Ergonomics
Model Availability
Recommendations

Safety

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The Mazda 3 has standard Whiplash Reducing Headrests, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Whiplash Reducing Headrests system moves the headrests forward to prevent neck and spine injuries. The Civic Si doesn’t offer a whiplash protection system.

With its standard Smart Brake Support, the Mazda 3 is better at preventing collisions with pedestrians than the Honda Civic Si, according to the Insurance Institute for Highway Safety:

	Mazda 3	Civic Si
Overall Evaluation	GOOD	ACCEPTABLE
	Crossing Child - DAY
12 MPH	AVOIDED	AVOIDED
25 MPH	AVOIDED	AVOIDED
	Crossing Adult - NIGHT
12 MPH Brights	AVOIDED	AVOIDED
12 MPH Low beams	AVOIDED	-10 MPH
25 MPH Brights	AVOIDED	-22 MPH
25 MPH Low beams	AVOIDED	-21 MPH
	Parallel Adult - NIGHT
25 MPH Brights	AVOIDED	AVOIDED
25 MPH Low beams	AVOIDED	AVOIDED
37 MPH Brights	AVOIDED	AVOIDED
Warning Issued-Brights	2.4 sec	2 sec
37 MPH Low beams	AVOIDED	-18 MPH
Warning Issued-Low beams	1.7 sec	1.1 sec

Over 200 people are killed each year when backed over by motor vehicles. The Mazda 3 Turbo Premium Plus has standard Smart Brake Support that use rear sensors to monitor for objects to the rear and automatically apply the brakes to prevent a collision. The Civic Si doesn’t offer backup collision prevention brakes.

The Mazda 3 offers all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The Civic Si doesn’t offer all-wheel drive.

The Mazda 3 Turbo Premium Plus has a standard 360-Degree Monitor to allow the driver to see objects all around the vehicle on a screen. The Civic Si only offers a rear monitor.

Both the Mazda 3 and Civic Si have rear cross-traffic warning, but the Mazda 3 Turbo Premium Plus has Rear Cross Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The Civic Si’s Rear Cross Traffic Monitor doesn’t automatically brake.

Both the Mazda 3 and the Civic Si have standard driver and passenger frontal airbags, front and rear side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, front wheel drive, height adjustable front shoulder belts, 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 and driver alert monitors.

The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the Mazda 3 is safer than the Honda Civic Si:

	Mazda 3	Civic Si
OVERALL STARS	5 Stars	4 Stars
	Driver
STARS	5 Stars	5 Stars
HIC	89	325
Neck Injury Risk	17%	30%
Neck Stress	214 lbs.	241 lbs.
Leg Forces (l/r)	205/212 lbs.	189/372 lbs.
	Passenger
STARS	5 Stars	4 Stars
HIC	153	444
Chest Compression	.4 inches	.4 inches
Neck Compression	20 lbs.	61 lbs.
Leg Forces (l/r)	178/201 lbs.	275/164 lbs.

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

The Insurance Institute for Highway Safety does 40 MPH moderate front offset crash tests on new cars. In this updated test, results indicate that the Mazda 3 is safer than the Civic Si:

	Mazda 3	Civic Si
Overall Evaluation	GOOD	ACCEPTABLE
Structure	GOOD	GOOD
	Driver Injury Measures
Head/Neck Rating	GOOD	GOOD
Head Injury Criterion	148	377
Chest Rating	GOOD	GOOD
Thigh/hip Rating	GOOD	GOOD
Leg/foot Rating	GOOD	GOOD
Leg Forces L/R	405/405 pounds	607/495 pounds
Restraints	GOOD	GOOD
	Rear Passenger Injury Measures
Head/Neck Rating	GOOD	GOOD
Chest Rating	GOOD	GOOD
Thigh Rating	GOOD	GOOD
Restraints	ACCEPTABLE	MARGINAL

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 Mazda 3 is safer than the Honda Civic Si:

	Mazda 3	Civic Si
	Front Seat
STARS	5 Stars	5 Stars
HIC	112	195
Abdominal Force	238 lbs.	286 lbs.
Hip Force	239 lbs.	286 lbs.
	Rear Seat
STARS	5 Stars	5 Stars
Spine Acceleration	71 G’s	79 G’s
	Into Pole
STARS	5 Stars	5 Stars
Max Damage Depth	10 inches	12 inches
HIC	199	260
Spine Acceleration	30 G’s	51 G’s
Hip Force	527 lbs.	805 lbs.

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

The Mazda 3 Sedan has achieved the Insurance Institute for Highway Safety’s (IIHS) highest rating of “Top Safety Pick Plus” for the 2025 model year. This distinction is based on its exceptional performance in IIHS’ rigorous battery of safety tests. Specifically, it earned a “Good” rating in the latest, more stringent moderate overlap front crash test, a “Good” result in the updated side impact test, and a “Good” score in the revised pedestrian crash prevention test. The Civic Si is only a standard “Top Safety Pick” for 2025.

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 Mazda 3’s reliability 22 points higher than the Civic Si.

J.D. Power and Associates’ 2024 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Mazda vehicles are more reliable than Honda vehicles. J.D. Power ranks Mazda above average in long-term dependability. With 5 more problems per 100 vehicles in the first three years of ownership, Honda is rated below average.

Engine

The Mazda 3’s optional 2.5 turbo 4-cylinder produces 50 more horsepower (250 vs. 200) and 128 lbs.-ft. more torque (320 vs. 192) than the Civic Si’s 1.5 turbo 4-cylinder.

As tested in Motor Trend the Mazda 3 4 cyl. is faster than the Honda Civic Si (manual transmissions tested):

	3	Civic Si
Zero to 60 MPH	6.9 sec	7.1 sec
Quarter Mile	15.2 sec	15.3 sec
Speed in 1/4 Mile	93 MPH	92.8 MPH

Fuel Economy and Range

An engine control system that can shut down some of the engine’s cylinders helps improve the Mazda 3 (except Turbo)’s fuel efficiency. The Civic Si doesn’t offer a system that can shut down part of the engine.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mazda 3 higher (7 out of 10) than the Honda Civic Si (5). This means the Mazda 3 produces up to 8 pounds less smog-producing pollutants than the Civic Si every 15,000 miles.

Transmission

The Mazda 3 has a standard automatic transmission, for driver comfort, especially in the city. The Civic Si doesn’t offer an automatic transmission.

Brakes and Stopping

The Mazda 3 stops shorter than the Civic Si:

	Mazda 3	Civic Si
60 to 0 MPH	125 feet	134 feet	Consumer Reports
60 to 0 MPH (Wet)	134 feet	147 feet	Consumer Reports

Tires and Wheels

The Mazda 3 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the Civic Si; it requires you to depend on roadside assistance and your vehicle will have to be towed.

Suspension and Handling

For better handling and stability, the track (width between the wheels) on the Mazda 3 is 1.2 inches wider in the front and .5 inches wider in the rear than on the Civic Si.

For better maneuverability, the Mazda 3’s turning circle is 3.3 feet tighter than the Civic Si’s (34.8 feet vs. 38.1 feet).

Chassis

The Mazda 3 Sedan is 8.4 inches shorter than the Civic Si, making the Mazda 3 easier to handle, maneuver and park in tight spaces.

Passenger Space

The Mazda 3 Sedan has .4 inches more front headroom, .3 inches more front hip room, .2 inches more rear headroom and 2 inches more rear hip room than the Civic Si.

Cargo Capacity

To make loading and unloading groceries and cargo easier, especially for short adults, the Mazda 3 Premium Hatchback has a standard power trunk, which opens and closes automatically by pressing a button. The Civic Si doesn’t offer a power trunk.

Ergonomics

The Mazda 3 Auto 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 Civic Si doesn’t offer a remote starting system.

When two different drivers share the Mazda 3 Preferred/Carbon/Premium, the memory seats and mirrors make it convenient for both. Each keyless remote activates different, customized memories for the driver’s seat position and outside mirror angle. The Civic Si doesn’t offer a memory system.

The Mazda 3 Premium has a standard heads-up display that projects speed, warning and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Civic Si doesn’t offer a heads-up display.

The Mazda 3’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 Civic Si’s rear power window switches have to be held the entire time to open or close them fully.

The Mazda 3 Select/Preferred/Carbon/Premium’s standard wipers adjust their speed and turn on and off automatically according to the amount of rainfall on the windshield. The Civic Si’s intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.

To help drivers see further while navigating curves, the Mazda 3 Premium has standard adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The Civic Si doesn’t offer cornering lights.

When the Mazda 3 Preferred/Carbon/Premium 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 Civic Si’s mirrors don’t automatically adjust for backing.

The Mazda 3’s optional 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 Civic Si doesn’t offer the luxury of automatic dimming mirrors.

On extremely cold winter days, the Mazda 3 Turbo Premium Plus’ standard heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The Civic Si doesn’t offer a heated steering wheel.

The Mazda 3 Select Sport/Preferred/Carbon/Premium’s 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. The Civic Si doesn’t offer dual zone air conditioning.

Both the Mazda 3 and the Civic Si offer rear vents. For greater rear passenger comfort, the Mazda 3 Select Sport/Preferred/Carbon/Premium has standard rear air conditioning vents to keep rear occupants cool in summer or warm in winter. The Civic Si doesn’t offer rear air conditioning vents, only heat vents.

Compared to the Honda Civic Si, the Mazda 3 eliminates the need for separate garage door openers and associated risks of losing, breaking, or having dead batteries with its optional integrated Homelink® universal remote controlled from the rear view mirror.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mazda 3 offers an optional wireless phone charging system (Qi) in the front center console. The Civic Si doesn’t offer wireless personal charging.

Model Availability

The Mazda 3 comes in sedan and four door hatchback bodystyles; the Honda Civic Si isn’t available as a four door hatchback.

Recommendations

The Mazda 3 has won recognition from these important consumer publications:

	Mazda 3	Civic Si
Consumer Reports® Recommends	TRUE	TRUE
Car Book “Best Bet”	TRUE	n/a

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