The 2011 Infiniti M looks distinct from the past edition, but it rests on an identical 114.2-inch wheelbase. It’s 1.5 inches wider, slightly longer and slightly lower. That translates into plenty of room for four adults, and a fifth on occasion.
It’s an exceptionally comfortable place to ride, in front or in back. Both driver and front passenger get 10-way power seats, and the front cabin has good head and shoulder room, minus a little width for the thicker center console.
The back seats' high, supportive cushions felt fine, but the tall doors and rear deck gives the rear seat a closed-in feel. Back-seat comfort is tops in its class, however–the seats truly are sculpted to a human form. The tallest passengers might find it a little light on headroom, but the 2011 M doesn’t sacrifice rear-seat comfort for its looks, as do the Jaguar XF and to some degree, the seat-on-the-floor Audi A6.
The M's trunk is usefully large, though not all that long; cabin storage is fine, with a shallow-ish console augmented by a deep glovebox.