If you are daring and adventurous, you can have it added. Either ask the dealership for a quote to have it added, or consider enabling it yourself as some other forum members here have. If you need help finding the thread that discusses enabling the cruise control, ask and we can dig it up.
Found it:
I was able to Enable OEM Cruise control of my 2014 Mirage DE 5-speed Manual.
These cars are what's called
drive-by-wire. That is, there is no direct linkage between the gas pedal and the throttle body as in days of old. Instead, the gas pedal, through a computer, sends a signal to a small motor that controls the throttle body. This arrangement makes it somewhat easy to add - enable, really - cruise control. I *think* all is needed is the switches on the steering wheel and brake and then, enable the feature in the Mirage ETACS. If I recall correctly, the wiring is in place (though that was for an older model - not sure about the 2017s.) Anyway, if the dealer adds it, it won't interfere with warranty coverage. Dealers are tuned in to any modifications that are done outside of the dealer network, and usually ask that modifications be removed before proceeding with service.
Some solid advice for you to consider here. For myself, I had decided I wanted a new car and thus set aside considering buying a used car, so that wasn't a problem for me. I can see how someone else might want to compare but for me, the set of features available for the Mirage made me not want to consider getting someone else's problems.
For example, the Mirage has a USB input for the radio. I haven't used the CD player yet on mine. I loaded a USB device with music files and can browse my music collection way beyond what I can fit on a single CD. In addition, I use enjoy using the bluetooth link with my phone for calls and music playback through the radio. It's a novel step up for me.