In my old garage in the states I had shelves running the entire length on both sides, washer/drier at the top end, and still had space to park the sit on mower, an '83 Buick Regal Stationwagon and a Mercury Villager with enough space to open the doors. God I miss that garage! My shack here will house any of my vehicles except the BMWs (too long), but only one at a time. Unbelieveably, it is bigger than the average Brit garage, as most people here use there's as storage as it is usually too tight to get their cars in!
I am planning to buy the house from the owner along with a chunk of the surrounding field at some point in the next few years. The field purchase should provide space for a 4 bay garage, machine shop & rebuild area... The thought of it makes it easier to get out of bed in the mornings!