Yea, it can be a pain getting things going when you don't drive them all the time, but OTOH when you've got one vehicle in the shop having a spare saves a lot on renting a car and I don't need to pay for car rental insurance in my car insurance.
And we did drop one car down and I'm not sure the scheduling between the 3 users is worth the savings - you'd have to ask them, but there's a lot of seeming stress between the 3 people. It can be hard enough scheduling an appointment between work and home tasks, forget about now mixing in 2 other peoples potential schedules! It can be done, but there's a lot of overhead.
Then again through inheritance we now have an extra pick-up truck, which is an expense and we really need to decide which one to keep I think...