It's a dedicated garage to park 4 cars, motorcycles, UTV, ZTR etc. I already have a barn with 18 foot clearance to the soffits.8 foot ceiling? Are you going to do anything but park in there? My pole building has 12 foot ceilings and I wouldn't want anything less. I have 7 foot high doors on my garage and my F-150 antenna hits the door and I can't get the tractor in with the ROPs up. I park in the pole barn because of that.
I can see 7 foot doors and 8 foot ceilings in a two car garage but not in a 30X50 building.
I'd prefer 10 foot finished ceilings but can't due to local building restrictions. Same goes for the 2nd floor...I have to keep floor square footage to be within certain limits. Welcome to Canada and its excessive bureaucracy.