2019 Audi A5 vs. 2019 Mercedes C-Class Cabriolet

Detailed Review, Specifications & Comparison

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The A5’s standard pretensioning seatbelts also sense rear collisions and remove slack from the seatbelts to help protect the occupants from whiplash and other injuries. The C-Class Cabriolet doesn’t offer a whiplash protection system.

The A5 has standard Secondary Collision Brake Assist, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The C-Class Cabriolet 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.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the A5. But it costs extra on the C-Class Cabriolet.

When descending a steep, off-road slope, the A5 Automatic’s standard Hill Descent Control allows you to creep down safely. The C-Class Cabriolet doesn’t offer Hill Descent Control.

Both the A5 and the C-Class Cabriolet have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

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 A5 the rating of “Top Pick” for 2017, a rating granted to only 155 vehicles tested by the IIHS. The C-Class Cabriolet has not been tested, yet.


The A5’s corrosion warranty is 7 years longer than the C-Class Cabriolet’s (12 vs. 5 years).


The Audi A5’s engine uses a cast iron block for durability, while the C-Class Cabriolet’s engines use an aluminum block. Aluminum engine blocks are much more prone to warp and crack at high temperatures than cast iron.

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 A5’s reliability 11 points higher than the C-Class Cabriolet.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Audi vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Audi 8th in reliability, above the industry average. With 10 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Audi vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Audi 10 places higher in reliability than Mercedes.

Fuel Economy and Range

On the EPA test cycle the A5 gets better fuel mileage than the C-Class Cabriolet:




2.0 turbo 4 cyl.

23 city/34 hwy

C-Class Cabriolet


300 2.0 turbo 4 cyl.

21 city/29 hwy


300 2.0 turbo 4 cyl.

21 city/29 hwy

AMG 43 3.0 turbo V6

18 city/25 hwy

Regenerative brakes improve the A5’s fuel efficiency by converting inertia back into energy instead of wasting it. The C-Class Cabriolet doesn’t offer a regenerative braking system.

To lower fuel costs and make buying fuel easier, the Audi A5 uses regular unleaded gasoline (premium recommended for maximum performance). The C-Class Cabriolet requires premium, which can cost 20 to 55 cents more per gallon.


The A5 offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The C-Class Cabriolet doesn’t offer an SMG or a conventional manual transmission.

The A5 Auto’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The C-Class Cabriolet doesn’t offer launch control.

Brakes and Stopping

For better stopping power the A5’s standard brake rotors are larger than those on the C-Class Cabriolet:



Front Rotors

13.3 inches

13 inches

Rear Rotors

13 inches

11.8 inches

Tires and Wheels

For better traction, the A5 has larger standard tires than the C-Class Cabriolet (245/40R18 vs. 225/45R18). The A5’s optional tires are larger than the largest tires available on the C-Class Cabriolet (255/35R19 vs. 225/45R18).

The A5’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the C-Class Cabriolet’s standard 45 series front tires. The A5’s optional tires have a lower 35 series profile than the AMG C 43 Cabriolet’s optional 40 series front tires.


The Audi A5 may be more efficient, handle and accelerate better because it weighs about 250 pounds less than the Mercedes C-Class Cabriolet.

Passenger Space

The A5 Coupe has 2.7 cubic feet more passenger volume than the C-Class Cabriolet (84 vs. 81.3).

Cargo Capacity

The A5 Cabriolet has a larger trunk with its top up than the C-Class Cabriolet with its top up (9.3 vs. 8.8 cubic feet).

Pressing a switch automatically lowers the A5’s rear seats, to make changing between passengers and cargo easier. The C-Class Cabriolet doesn’t offer automatic folding seats.

To make loading groceries and cargo easier when your hands are full, just kicking your foot under the back bumper can open the A5’s available trunk, leaving your hands completely free. The C-Class Cabriolet doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.


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