Passenger space is excellent in the sedan and now in the similarly sized wagon. And the wagons back seat is much more accommodating than the X5s, for example, despite the identical 45-cubic-foot rating. The 530xi has generous footroom under the front seats, and the backs of the front buckets have knee-friendly contours in them.EPA ratings are 20 mpg city and 27 highway, off just 1 and 2 mpg, respectively, from a rear-drive 530i.Theres no great mystery as to why we prefer wagons over SUVs. Heres how the 530xi wagon stacks up against a six-cylinder X5: It weighs 630 fewer pounds, scores better fuel economy, beats it to 60 mph by a half-second, stops from 70 mph to 0 in 11 fewer feet, has better grip around the skidpad, and hauls more cargo with the second-row seats in place.