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The A6 has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The IS Series 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 A6. But it costs extra on the IS Series.
A passive infrared night vision system optional on the A6 Prestige helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard. The IS Series doesn’t offer a night vision system.
The A6 offers an optional Top and Corner View Cameras to allow the driver to see objects all around the vehicle on a screen. The IS Series only offers a rear monitor and front and rear parking sensors that beep. That doesn’t help with obstacles to the sides.
Both the A6 and the IS Series have standard driver and passenger frontal airbags, front side-impact 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 blind spot warning systems and rear cross-path warning.
The Audi A6 weighs 529 to 683 pounds more than the Lexus IS Series. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.
The A6’s corrosion warranty is 6 years longer than the IS Series’ (12 vs. 6 years).
There are over 26 percent more Audi dealers than there are Lexus dealers, which makes it easier should you ever need service under the A6’s warranty.
A hardened steel chain, with no maintenance needs, drives the camshafts in the A6’s engine. A rubber belt that needs periodic replacement drives the IS 300 2.0 turbo 4 cyl.’s camshafts. If the IS Series’ cam drive belt breaks the engine could be severely damaged when the pistons hit the opened valves.
The A6’s 3.0 turbo V6 hybrid produces 94 more horsepower (335 vs. 241) and 111 lbs.-ft. more torque (369 vs. 258) than the IS 300’s standard 2.0 turbo 4 cyl. The A6’s 3.0 turbo V6 hybrid produces 75 more horsepower (335 vs. 260) and 133 lbs.-ft. more torque (369 vs. 236) than the IS 300 AWD’s standard 3.5 DOHC V6. The A6’s 3.0 turbo V6 hybrid produces 24 more horsepower (335 vs. 311) and 89 lbs.-ft. more torque (369 vs. 280) than the IS 350’s standard 3.5 DOHC V6.
On the EPA test cycle the A6 3.0T gets better fuel mileage than the IS Series AWD (22 city/29 hwy vs. 19 city/26 hwy).
Regenerative brakes improve the A6’s fuel efficiency by converting inertia back into energy instead of wasting it. The IS Series doesn’t offer a regenerative braking system.
In heavy traffic or at stoplights the A6’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The IS Series doesn’t offer an automatic engine start/stop system.
To lower fuel costs and make buying fuel easier, the Audi A6 uses regular unleaded gasoline (premium recommended for maximum performance). The IS Series requires premium, which can cost 20 to 55 cents more per gallon.
The A6 has 1.9 gallons more fuel capacity than the IS Series (19.3 vs. 17.4 gallons), for longer range between fill-ups.
The A6 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 IS Series doesn’t offer an SMG or a conventional manual transmission.
For better stopping power the A6’s brake rotors are larger than those on the IS Series:
For better traction, the A6 has larger standard tires than the IS Series (245/45R19 vs. 225/45R17). The A6’s optional tires are larger than the largest tires available on the IS Series (255/40R20 vs. 225/40R18).
The A6 Prestige’s optional tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the IS Series’ optional 40 series front tires.
For better ride, handling and brake cooling the A6 has standard 19-inch wheels. Smaller 17-inch wheels are standard on the IS Series. The A6 Prestige’s optional 21-inch wheels are larger than the 18-inch wheels optional on the IS Series.
For a smoother ride and more stable handling, the A6’s wheelbase is 4.9 inches longer than on the IS Series (115.1 inches vs. 110.2 inches).
For better handling and stability, the track (width between the wheels) on the A6 is 4.8 inches wider in the front and 2.7 inches wider in the rear than on the IS Series.
The A6 has 1.9 inches more front shoulder room, 1.2 inches more rear headroom, 5.2 inches more rear legroom and 3.1 inches more rear shoulder room than the IS Series.
To make loading and unloading groceries and cargo easier, especially for short adults, the A6 Prestige has a standard power trunk, which opens and closes automatically by pressing a button, or optionally by just kicking your foot under the back bumper, completely leaving your hands free. The IS Series doesn’t offer a power trunk.
The A6’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. An easy entry system costs extra on the IS Series.
The A6 Prestige has a standard heads-up display that projects speed and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The IS Series doesn’t offer a heads-up display.
The A6’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The IS Series’ standard manually variable intermittent wipers have to be constantly adjusted.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The A6 offers available headlight washers to keep headlight output high. The IS Series doesn’t offer headlight washers.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the A6 has standard extendable sun visors. The IS Series doesn’t offer extendable visors.
The A6 has standard heated front seats. Heated front seats cost extra on the IS Series. The A6 also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the IS Series.
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