The front seats of the A6 3.0 are well cushioned, but not deeply bolstered. Non-sporting drivers will prefer these seats, as they provide all the lateral retention they'll need for comfortable everyday driving while not requiring a climb over the side bolsters. There's lots of headroom, but the tallest drivers may find it has less legroom than the E-Class. Rear headrests, especially the center, impede rearward vision somewhat. The outside mirrors are on the small side, but larger than those on the E-Class.

The rear seat is contoured for two, though it will accommodate three adults even if cross-country trips would result in more intimacy than usually desired. There's plenty of rear legroom and headroom, though the rear seat bottom could use a little more support in the center.

The dash is well laid out, with controls that are easy to operate. Driver and passenger can set their own temperature. The sound system is easy to operate. Wood is tastefully used on the dash, center console, and door panels. Instruments are white-on-black in daylight, but at night illuminate in a jet-fighter cockpit red. It looks high-tech, and is theoretically better for night vision.

The A6 interior is a nice place to be and Audi's attention to detail is evident: Assist handles over the doors return softly when released. Front and rear seats have reading lights, and there are footwell lights front and rear as well. The door handles are also illuminated for easy nighttime exit, and a red LED light illuminates the center console area with a soft glow. Two cup holders are provided, both clever designs that take up minimum space and work well for standard drink cans. A small flip-down armrest holds a small cell phone, but there's not much cubby storage in the A6.

The leather in the RS 6 is buttery soft. Padded leather door inserts are in a contrasting color and have just the right amount of gather. The roof liner in the RS 6 is one of the best we've ever seen, made of alcantara that continues down the insides of the A-pillars.

The trunk is commodious and tall, with articulated hinges that don't enter the trunk itself: no more crushed grocery bags or wasted cargo space. With four cargo tie-downs and a cargo net, there's no reason for stuff to be rolling around the trunk. The rear seats are split 60/40 and fold down for additional cargo capacity.