The phrase "interior spaciousness" refers to the amount of open and free space inside a room or building. It means that the area is big, open, and not cluttered, providing a sense of roominess and comfort. Full definition
The car sits somewhat lower but the seating position is much the same, as is the feeling of interior spaciousness and driver comfort. (automobilemag.com)
Thanks to its increased dimensions and ergonomic cabin packaging, the New Generation i20 is one of the most competitive cars in its class for interior spaciousness. (thekoreancarblog.com)
Both vehicles sport similar outward looks, but the Avalon gives a sense of more interior spaciousness due to its 16 foot - 3 inch long frame being 4 inches more than the Camry. (continentaltoyota.com)