Typically it would mean what you gave up by choosing this option. So for example, if there was a competitor in this segment that had adaptive cruise control, the Mirage doesn't offer that, so it is a cost of the opportunity for that option.
But the Mirage fairs rather well in this, because despite being super affordable it has many creature comforts that aren't technically necessary like Bluetooth connectivity, Auto HVAC (even tho Mark and 7MO dont consider that a plus ), etc.
Resident Tire Engineer
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View my fuel log 2014 Mirage ES 1.2 manual: 44.4 mpg (US) ... 18.9 km/L ... 5.3 L/100 km ... 53.3 mpg (Imp)