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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 E-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 E-Class Cabriolet.
Both the A5 and the E-Class Cabriolet have standard driver and passenger frontal airbags, front side-impact airbags, driver 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 139 vehicles tested by the IIHS. The E-Class Cabriolet has not been tested, yet.
The A5’s corrosion warranty is 7 years longer than the E-Class Cabriolet’s (12 vs. 5 years).
The Audi A5’s engine uses a cast iron block for durability, while the E-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.
J.D. Power and Associates’ 2018 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 13th in reliability, above the industry average. With 6 more problems per 100 vehicles, Mercedes is ranked 15th.
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.
On the EPA test cycle the A5 gets better fuel mileage than the E 450 Cabriolet 4MATIC (23 city/34 hwy vs. 19 city/26 hwy).
Regenerative brakes improve the A5’s fuel efficiency by converting inertia back into energy instead of wasting it. The E-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 E-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 E-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 E-Class Cabriolet doesn’t offer launch control.
For better traction, the A5’s optional tires are larger than the largest tires available on the E-Class Cabriolet (255/35R19 vs. 245/45R18).
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 E-Class Cabriolet 4MATIC’s standard 45 series tires.
The Audi A5 may be more efficient, handle and accelerate better because it weighs about 350 to 600 pounds less than the Mercedes E-Class Cabriolet.
The A5 is 6 inches shorter than the E-Class Cabriolet, making the A5 easier to handle, maneuver and park in tight spaces.
J.D. Power and Associates surveys of service recipients show that Audi service is better than Mercedes. J.D. Power ranks Audi third in service department satisfaction. With a 3% lower rating, Mercedes is ranked 6th.
Heated windshield washer nozzles are standard on the A5 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The E-Class Cabriolet doesn’t offer heated windshield washer nozzles.
Both the A5 and the E-Class Cabriolet offer available heated front seats. The A5 Premium Plus/Prestige also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the E-Class Cabriolet.
Insurance will cost less for the A5 owner. The Car Book by Jack Gillis rates the A5 with a number “3” insurance rate while the E-Class Cabriolet is rated higher at a number “5” rate.
The A5 will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the A5 will retain 45.52% to 48.51% of its original price after five years, while the E-Class Cabriolet only retains 44.54% to 45.17%.
According to The Car Book by Jack Gillis, the A5 is less expensive to operate than the E-Class Cabriolet because it costs $45 less to do the manufacturer’s suggested maintenance for 50,000 miles. Typical repairs cost much less on the A5 than the E-Class Cabriolet, including $44 less for a water pump, $330 less for a muffler, $150 less for a starter, $159 less for fuel injection, $421 less for a timing belt/chain and $561 less for a power steering pump.
IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Audi A5 will be $10349 to $19270 less than for the Mercedes E-Class Cabriolet.
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