Built on an all-new platform, the 2010 Subaru Legacy offers roominess comparable to mainstream midsize sedans, with a focus on usable space and long-distance driving comfort. The wheelbase grows to 108.3-in., a 3.2-in. increase over the previous Subaru Legacy. The 2010 Legacy provides nearly four inches of additional rear legroom, which is enhanced by the scalloped back design of the new front seats.

The new Subaru Legacy is 3.2-in. higher and 3.6-in. wider than the previous model, yielding gains in head, shoulder and hip room. The 2010 Legacy offers more total passenger room (103 cu. ft.) than many competitors. The new-generation Subaru Legacy also offers one of the largest trunks (14.7 cu. ft.) in the segment - a significant achievement considering that the car's design requires packaging a rear differential and drive axles. Overall vehicle length is up by just 1.4-in. (now 186.4 in.), but overhang dimensions are reduced compared with the previous model.

The 2010 Subaru Legacy interior is not only more spacious than before, but takes another step up in refinement from an already-praised design in the previous model. The sporty four-dial instrument panel is augmented in all Subaru Legacy models by a multi-information display with trip computer located in the center of the dashboard. Richer looking appointments and details abound, including a sporty 3-spoke steering wheel (leather-wrapped in all but the base 2.5i). A new electronic parking brake - with an electronic Hill Holder System -- eliminates the traditional parking brake handle, freeing up space in the center console.