Anyone know if I can add a free day onto an existing rental and take it one way? For example if I rent for one day to return to the same place, can I extend it mid-rental with a one way eligible free day?
You can call in after the rental to apply a free day.
You can call in middle of a rental to change the return location, except one-ways to canada (or canada to the us) where you'll have to call the branch.
If you change a rental to a one-way, it'll reprice the whole rental not only the last day