That's different though. These people were basically using them as their personal cars, driving them back and forth to work every day.
Well, if their job doesn't require a lot of driving on official business, then there was need for a change. My dad used to have a state car a lot, because his job involved a lot of going out to visit school districts around the state. So he may have kept it a week at a time, if there were a few trips to make.
When I fly somewhere, I usually drive to the airport and park my car there. The mileage reimbursement and parking fees are *always* less than it would cost to get one-way rental cars to go to and from the airport. Yet, when I input the fact that I drove to the airport the travel system rejects it as an "unauthorized mode of travel!" Stupid stupid stupid.