2020 Mercedes C-Class Coupe vs. 2019 Audi A5

Detailed Review, Specifications & Comparison

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Safety

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The C-Class Coupe’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 A5 doesn’t offer a driver alert monitor.

Both the C-Class Coupe and the A5 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, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available all wheel drive, lane departure warning systems, around view monitors and rear cross-path warning.

Warranty

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There are over 26 percent more Mercedes dealers than there are Audi dealers, which makes it easier should you ever need service under the C-Class Coupe’s warranty.

Reliability

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To reliably power the ignition and other systems and to recharge the battery, the C-Class Coupe has a 150-amp alternator. The A5’s standard 110-amp alternator isn’t as powerful.

J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 12 more problems per 100 vehicles, Audi is ranked 22nd.

Engine

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The C-Class Coupe’s 2.0 turbo 4-cylinder produces 7 more horsepower (255 vs. 248) than the A5’s 2.0 turbo 4-cylinder.

Fuel Economy and Range

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The C-Class Coupe has 2.1 gallons more fuel capacity than the A5 (17.4 vs. 15.3 gallons), for longer range between fill-ups.

Environmental Friendliness

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In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes C-Class Coupe higher (6 out of 10) than the Audi A5 (5). This means the C-Class Coupe produces up to 6.9 pounds less smog-producing pollutants than the A5 every 15,000 miles.

Transmission

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A nine-speed automatic is standard on the Mercedes C-Class Coupe, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the A5.

Brakes and Stopping

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The C-Class Coupe’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the A5 are solid, not vented.

The C-Class Coupe stops shorter than the A5:

C-Class Coupe

A5

60 to 0 MPH

109 feet

117 feet

Motor Trend

Tires and Wheels

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Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the C-Class Coupe can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The A5 doesn’t offer run-flat tires.

Suspension and Handling

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The C-Class Coupe’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The A5 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the C-Class Coupe’s wheelbase is 3 inches longer than on the A5 Coupe (111.8 inches vs. 108.8 inches).

The C 300 4MATIC handles at .91 G’s, while the A5 Prestige Coupe pulls only .85 G’s of cornering force in a Motor Trend skidpad test.

The C 300 4MATIC executes Motor Trend’s “Figure Eight” maneuver quicker than the A5 Prestige Coupe (25.9 seconds @ .71 average G’s vs. 26.3 seconds @ .71 average G’s).

For better maneuverability, the C 300’s turning circle is .9 feet tighter than the A5’s (36.8 feet vs. 37.7 feet).

Passenger Space

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The C-Class Coupe has .7 inches more front legroom and 1 inch more rear shoulder room than the A5 Coupe.

Cargo Capacity

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A low lift-over trunk design makes loading and unloading the C-Class Coupe easier. The C-Class Coupe’s trunk lift-over height is 25.3 inches, while the A5’s liftover is 28.5 inches.

To make loading and unloading groceries and cargo easier, especially for short adults, the C-Class Coupe has a standard power trunk, which opens and closes automatically by pressing a button or just by kicking your foot under the back bumper, completely leaving your hands free. The A5 doesn’t offer a power trunk, so its trunk has to be closed manually.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Mercedes service is better than Audi. J.D. Power ranks Mercedes fifth in service department satisfaction. With a 13% lower rating, Audi is ranked 8th.

Ergonomics

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The C-Class Coupe 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 A5 doesn’t offer a remote starting system.

Unlike the driver-only memory seat and mirrors optional at extra cost in the A5, the C-Class Coupe offers an optional passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The C-Class Coupe’s 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 A5 doesn’t offer an easy entry system.

If the windows are left open on the C-Class Coupe 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 A5 can’t use the remote to operate the windows.

To help drivers see further while navigating curves, the C-Class Coupe offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The A5 doesn’t offer cornering lights.

The C-Class Coupe’s optional Active Parking Assist can parallel park or back into a parking spot by itself, stopping and changing direction automatically. The A5 Prestige’s automatic parking system requires operating the brakes and transmission to safely park.

Model Availability

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The C-Class Coupe is available in both rear-wheel drive and all-wheel drive configurations. The A5 doesn’t offer a two-wheel drive configuration.

Economic Advantages

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According to The Car Book by Jack Gillis, the C-Class Coupe is less expensive to operate than the A5 because typical repairs cost much less on the C-Class Coupe than the A5, including $50 less for a water pump, $31 less for front brake pads, $153 less for a starter, $5 less for fuel injection, $48 less for front struts and $320 less for a timing belt/chain.

Recommendations

© 1999 - 2020 Advanta-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. 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. 6IUEX-0KENZ 45.55.47.189 2020/10/20

Consumer Reports® recommends the Mercedes C-Class Coupe, based on reliability, safety and performance.

J.D. Power and Associates rated the C-Class Coupe first among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The A5 isn’t in the top three.

The Mercedes C-Class outsold the Audi A5/S5 by almost three to one during the 2019 model year.

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