I have a 2.5 car garage as well. My wife's Audi parks on the short side along with storage shelving (filled with junk in the picture while we were making space), while my Chevy Tahoe shares the long side with my smart car and our treadmill.
We had to maneuver the Tahoe as close to the left wall as possible to leave enough room to walk between it and more storage shelving, but there's plenty of room in front of it for the treadmill and behind it for the smart car.