Compare the2024 Lexus ISVS 2024 Honda Civic Si

Safety
Warranty
Reliability
Engine
Fuel Economy and Range
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Passenger Space
Cargo Capacity
Servicing Ease
Ergonomics
Recommendations

Safety

© 1999 - 2024Advanta-STAR Automotive Research, all rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America (“Advanta-STAR”). If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it, or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. Removal of this watermark/notification without prior written license and approval received from Advanta-STAR is an agreement, understanding, and/or stipulation by the person(s), entities, agents, attorneys, and any other persons involved in the removal of this watermark/notification (including but not limited to Search Optics, LLC and any and all parent entities, sister entities, and subsidiary entities of Search Optics, LLC and/or any other entity, agent, attorney, and persons related in any manner to Search Optics, LLC) to: 1) an agreed upon amount of liquidated monetary damages of a minimum of $1,250,000.00 US Dollars in favor of Advanta-STAR; 2) the jurisdiction and enforcement of any legal claims associated with this matter asserted by Advanta-STAR in the United States Federal District Court in Portand, Oregon; and 3) service of process of any legal claims asserted by Advanta-STAR associated with this matter may be accomplished by First-Class Postage by the United States Postal Service or comparable service. XPYNN-M34HG 2a06:98c0:3600::103 2024/12/21

The IS’ optional pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Civic Si doesn’t offer pre-crash pretensioners.

The IS 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 Civic Si 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 IS offers optional Intuitive Parking Assist with Auto Braking that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The Civic Si doesn’t offer backup collision prevention brakes.

The IS 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 IS offers an optional Panoramic View 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 IS and Civic Si have rear cross-traffic warning, but the IS offers optional Rear Cross-Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The Civic Si’s Cross Traffic Monitor doesn’t automatically brake.

The IS has standard Safety Connect®, which uses a global positioning satellite (GPS) receiver and a cellular system to help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The Civic Si doesn’t offer a GPS response system, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.

Both the IS 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, 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 and rear cross-path warning.

The Lexus IS weighs 763 to 939 pounds more than the Honda Civic Si. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts. Crosswinds also affect lighter cars more.

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

	IS	Civic Si
	Passenger
STARS	4 Stars	4 Stars
HIC	282	444
Neck Stress	152 lbs.	189 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 Lexus IS is safer than the Honda Civic Si:

	IS	Civic Si
	Front Seat
STARS	5 Stars	5 Stars
HIC	142	195
Abdominal Force	203 lbs.	286 lbs.
	Rear Seat
STARS	5 Stars	5 Stars
HIC	162	268
Spine Acceleration	28 G’s	79 G’s
Hip Force	438 lbs.	516 lbs.
	Into Pole
STARS	5 Stars	5 Stars
Spine Acceleration	34 G’s	51 G’s
Hip Force	650 lbs.	805 lbs.

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

Warranty

The IS comes with a full 4-year/50,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The Civic Si’s 3-year/36,000-mile basic warranty expires 1 year or 14,000 miles sooner.

Lexus’ powertrain warranty covers the IS 1 year and 10,000 miles longer than Honda covers the Civic Si. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the Civic Si ends after only 5 years or 60,000 miles.

The IS’ corrosion warranty is 1 year longer than the Civic Si’s (6 vs. 5 years).

Reliability

J.D. Power and Associates rated the IS first among compact premium cars in their 2023 Initial Quality Study. The Civic Si isn’t in the top three in its category.

J.D. Power and Associates’ 2023 Initial Quality Study of new car owners surveyed provide the statistics that show that Lexus vehicles are better in initial quality than Honda vehicles. J.D. Power ranks Lexus above average in initial quality. With 19 more problems per 100 vehicles, Honda is rated lower.

J.D. Power and Associates’ 2022 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Lexus vehicles are more reliable than Honda vehicles. J.D. Power ranks Lexus above average in long-term dependability. With 33 more problems per 100 vehicles in the first three years of ownership, Honda is rated below average.

From surveys of all its subscribers, Consumer Reports’ January 2023 Auto Issue reports that Lexus vehicles are more reliable than Honda vehicles. Consumer Reports ranks Lexus second in overall reliability. Honda is ranked fifth.

Engine

The IS 300’s standard 2.0 turbo 4-cylinder produces 41 more horsepower (241 vs. 200) and 66 lbs.-ft. more torque (258 vs. 192) than the Civic Si’s 1.5 turbo 4-cylinder. The IS 300 AWD’s standard 3.5 DOHC V6 produces 60 more horsepower (260 vs. 200) and 44 lbs.-ft. more torque (236 vs. 192) than the Civic Si’s 1.5 turbo 4-cylinder. The IS 350 F Sport’s standard 3.5 DOHC V6 produces 111 more horsepower (311 vs. 200) and 88 lbs.-ft. more torque (280 vs. 192) than the Civic Si’s 1.5 turbo 4-cylinder. The IS 500’s standard 5.0 DOHC V8 produces 272 more horsepower (472 vs. 200) and 203 lbs.-ft. more torque (395 vs. 192) than the Civic Si’s 1.5 turbo 4-cylinder.

Fuel Economy and Range

The IS has 5 gallons more fuel capacity than the Civic Si (17.4 vs. 12.4 gallons), for longer range between fill-ups.

Transmission

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

To facilitate fast shifting and allow the driver to focus on the road, the IS F Sport has a standard up-shift light to indicate when the engine is approaching redline. The Civic Si doesn’t offer an up-shift light.

Brakes and Stopping

For better stopping power the IS’ brake rotors are larger than those on the Civic Si:

	IS	IS 500 Performance	Civic Si
Front Rotors	13.1 inches	14 inches	12.3 inches
Rear Rotors	11.7 inches	12.7 inches	11.1 inches

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

The IS stops shorter than the Civic Si:

	IS	Civic Si
70 to 0 MPH	159 feet	160 feet	Car and Driver
60 to 0 MPH	129 feet	134 feet	Consumer Reports
60 to 0 MPH (Wet)	141 feet	147 feet	Consumer Reports

Tires and Wheels

The IS F Sport’s 265/35R19 rear tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the Civic Si’s 40 series tires.

For better ride, handling and brake cooling the IS F Sport has standard 19-inch wheels. The Civic Si’s largest wheels are only 18-inches.

The IS 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

The IS 500 F Sport’s has front and rear gas-charged shocks for better control over choppy roads. The Civic Si’s suspension doesn’t offer front gas-charged shocks.

The IS 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. The Civic Si’s suspension doesn’t offer adjustable shock absorbers.

For a smoother ride and more stable handling, the IS’ wheelbase is 2.5 inches longer than on the Civic Si (110.2 inches vs. 107.7 inches).

For better handling and stability, the average track (width between the wheels) on the IS is 1.7 inches wider in the front and .9 inches wider in the rear than the track on the Civic Si.

The IS’ front to rear weight distribution is more even (54% to 46%) than the Civic Si’s (60.6% to 39.4%). This gives the IS more stable handling and braking.

The IS 500 Performance executes Motor Trend’s “Figure Eight” maneuver 1.1 seconds quicker than the Civic Si (25.2 seconds @ .74 average G’s vs. 26.3 seconds @ .67 average G’s).

For better maneuverability, the IS’ turning circle is 3.9 feet tighter than the Civic Si’s (34.2 feet vs. 38.1 feet). The IS AWD’s turning circle is 2.7 feet tighter than the Civic Si’s (35.4 feet vs. 38.1 feet).

Passenger Space

The IS has .6 inches more front headroom, 2.5 inches more front legroom and 5.1 inches more rear hip room than the Civic Si.

Cargo Capacity

To allow full utilization of available cargo room, the IS’ trunk lid uses concealed beam hinges that don’t intrude into the trunk. Its intrusive beam hinge reduces the Civic Si’s useful trunk space.

With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the IS offers cargo security. The Civic Si’s non-lockable remote release defeats cargo security.

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

Servicing Ease

The IS uses gas struts to support the hood for easier service access. The Civic Si 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.

The engine in the IS is mounted longitudinally (North-South), instead of sideways, as in the Civic Si. This makes it easier to service and maintain, because the accessory belts are in front.

J.D. Power and Associates surveys of service recipients show that Lexus service is better than Honda. J.D. Power ranks Lexus first in service department satisfaction. With a 62% lower rating, Honda is ranked 25th.

Ergonomics

The IS has a standard 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 Civic Si doesn’t offer a remote starting system.

When three different drivers share the IS, the optional memory system makes it convenient for all three. Each setting activates different, customized memories for the driver’s seat (memory seat optional for the front passenger), steering wheel position and outside mirror angle. The Civic Si doesn’t offer a memory system.

The IS’ standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. The Civic Si doesn’t offer an easy entry system.

The IS’ instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The Civic Si does not have an oil pressure gauge.

The IS’ 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.

If the windows are left open on the IS 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 Lexus service department.) The driver of the Civic Si can only close the windows from inside the vehicle, with the ignition on.

The IS’ optional 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.

Consumer Reports rated the IS’ headlight performance “Very Good,” a higher rating than the Civic Si’s headlights, which were rated “Good.”

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

A power rear sunshade is optional in the IS to help block heat and glare for the rear passengers. The Civic Si doesn’t offer a rear sunshade.

When the IS with available tilt-down mirrors 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 IS’ 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 Civic Si doesn’t offer the luxury of automatic dimming mirrors.

The IS offers optional heated front seats, which keep the driver and front passenger extremely comfortable in the winter. Heated seats aren’t available in the Civic Si.

Optional air-conditioned seats in the IS keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The Civic Si doesn’t offer air-conditioned seats.

On extremely cold winter days, the IS’ optional 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 IS’ 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 IS and the Civic Si offer rear vents. For greater rear passenger comfort, the IS 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.

To direct the driver from any location to a given street address with audible turn-by-turn directions, a GPS navigation system is available on the IS. The IS’ 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 Civic Si doesn’t offer a navigation system.

Recommendations

Consumer Reports® recommends both the Lexus IS and the Honda Civic Si, based on reliability, safety and performance.

J.D. Power and Associates rated the IS first among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The Civic Si isn’t in the top three.

See Available Inventory