2019 Audi S5 vs. 2019 Porsche 911

Detailed Review, Specifications & Comparison

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For enhanced safety, the front and rear seat shoulder belts of the Audi S5 have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Porsche 911 doesn’t offer pretensioners for the rear seat belts.

The S5’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The 911 doesn’t offer pre-crash pretensioners.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S5. But it costs extra on the 911.

The S5 Prestige’s lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The 911 doesn’t offer a lane departure warning system.

The S5 Prestige has a standard Top and Corner View Cameras to allow the driver to see objects all around the vehicle on a screen. The 911 only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

To help make backing safer, the S5’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The 911 doesn’t offer a cross-path warning system.

Both the S5 and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, post-collision automatic braking systems, daytime running lights, rearview cameras and available blind spot warning systems.

For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, and its standard front crash prevention system, the Insurance Institute for Highway Safety grants the S5 the rating of “Top Pick” for 2017, a rating granted to only 139 vehicles tested by the IIHS. The 911 has not been tested, yet.


There are over 59 percent more Audi dealers than there are Porsche dealers, which makes it much easier should you ever need service under the S5’s warranty.


From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Porsche vehicles. Consumer Reports ranks Audi 4 places higher in reliability than Porsche.


The S5’s 3.0 turbo V6 produces 38 lbs.-ft. more torque (369 vs. 331) than the 911’s standard 3.0 turbo 6 cyl. The S5’s 3.0 turbo V6 produces 1 lbs.-ft. more torque (369 vs. 368) than the 911 S’ standard 3.0 turbo 6 cyl.

Fuel Economy and Range

On the EPA test cycle the S5 gets better fuel mileage than the 911 AWD:









20 city/28 hwy

3.0 twin turbo 6 cyl./Manual


3.0 turbo V6/8-spd. Auto

21 city/30 hwy

22 city/28 hwy

3.0 twin turbo 6 cyl./Auto


3.0 turbo V6/8-spd. Auto

21 city/29 hwy

21 city/28 hwy

3.0 twin turbo 6 cyl./Auto




21 city/28 hwy

3.0 twin turbo 6 cyl./Auto




20 city/26 hwy

3.0 twin turbo 6 cyl./Auto




20 city/25 hwy

3.0 twin turbo 6 cyl./Auto




19 city/24 hwy

3.8 twin turbo 6 cyl./Auto

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi S5 higher (5 out of 10) than the Porsche 911 (1). This means the S5 produces up to 39 pounds less smog-producing pollutants than the 911 every 15,000 miles.


The Audi S5 comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the 911.

An eight-speed automatic is standard on the Audi S5, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the 911.

Brakes and Stopping

For better stopping power the S5’s standard brake rotors are larger than those on the 911:




Front Rotors

13.8 inches

13 inches

Tires and Wheels

For better traction, the S5 has larger standard tires than the 911 (245/40R18 vs. 235/40R19).

The S5’s optional tires provide better handling because they have a lower 30 series profile (height to width ratio) that provides a stiffer sidewall than the 911’s optional 35 series front tires.

Suspension and Handling

For a smoother ride and more stable handling, the S5’s wheelbase is longer than on the 911:





108.8 inches

96.5 inches


108.9 inches

96.5 inches

For better handling and stability, the track (width between the wheels) on the S5 is 1.4 inches wider in the front and .5 inches wider in the rear than the average track on the 911.

The S5’s front to rear weight distribution is more even (56.7% to 43.3%) than the 911’s (40.1% to 59.9%). This gives the S5 more stable handling and braking.


As tested by Car and Driver, the interior of the S5 Prestige Coupe is quieter than the 911 GT2 RS:




At idle

39 dB

68 dB


75 dB

95 dB

70 MPH Cruising

65 dB

79 dB

Passenger Space

Because it has more passenger and cargo room, the EPA rates the S5 Coupe a Subcompact car, while the 911 Coupe is rated a Minicompact. The EPA rates the S5 Cabriolet a Subcompact car, while the 911 Cabriolet is rated a Minicompact.

The S5 Coupe has 14 cubic feet more passenger volume than the 911 Coupe (84 vs. 70). The S5 Cabriolet has 13 cubic feet more passenger volume than the 911 Cabriolet (81 vs. 68).

The S5 Coupe has 1 inch more front headroom, 4.5 inches more front shoulder room, 5.1 inches more rear headroom, 7.7 inches more rear legroom and 2.4 inches more rear shoulder room than the 911 Coupe.

The S5 Convertible has 2 inches more front headroom, 4.5 inches more front shoulder room and 5.3 inches more rear headroom than the 911 Cabriolet.

Cargo Capacity

The S5 Coupe has a much larger trunk than the 911 Coupe with its rear seat up (11.6 vs. 5.1 cubic feet). The S5 has a much larger trunk with its rear seat folded than the 911 Coupe with its rear seat folded (11.6 vs. 9.1 cubic feet).

The S5 Cabriolet has a much larger trunk with its top down than the 911 Cabriolet (7.2 vs. 5.1 cubic feet).

With its coupe body style, valet key, locking rear seatbacks and remote trunk release lockout, the S5 offers cargo security. The 911’s non-lockable folding seat and non-lockable remote release defeat cargo security.

To make loading groceries and cargo easier when your hands are full, the S5’s trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The 911 doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.


The S5 Prestige has a standard heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The 911 doesn’t offer a heads-up display.

If the windows are left open on the S5 the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the 911 can only operate the windows from inside the vehicle, with the ignition on.

Heated windshield washer nozzles are standard on the S5 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The 911 doesn’t offer heated windshield washer nozzles.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the S5 has standard extendable sun visors. The 911 doesn’t offer extendable visors.

For greater rear passenger comfort, the S5 has standard rear a/c vents to keep rear occupants more comfortable. The 911 doesn’t offer rear vents.

The S5 Prestige’s Park Steering Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The 911 doesn’t offer an automated parking system.

Model Availability

The Audi S5 comes in coupe, convertible and four-door hatchback bodystyles; the Porsche 911 isn’t available as a four-door.

Economic Advantages

Insurance will cost less for the S5 owner. The Complete Car Cost Guide estimates that insurance for the S5 will cost $1160 less than the 911 over a five-year period.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Audi S5 will be $19638 to $86965 less than for the Porsche 911.


The Audi A5/S5/RS 5 outsold the Porsche 911 by over three to one during the 2018 model year.

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

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