I believe the vehicle is rated from Mitsubishi to be able to tow exactly 0lbs.
However, if I recall correctly the Mirage has a total loads capacity of like 700lbs or something. How much of that is towing is dependent on the tow hitch you end up putting on. The Curt one is rated at 2000lbs towing, 200lbs tongue weight. So minus a human or two and add the weight of the tow hitch itself and you're looking at maybe 400lbs of useful towing capacity.
The suspension is so soft, though, that you will be bottoming out the rear real hard. Others on the forum have swapped in Beetle springs if they are towing regularly (taller, slightly stiffer).
Edit: on mobile this forum is perfectly formatted so that when I try to scroll in the edit post screen, my finger hits the "Delete Post" button EVERY TIME