You may check ads section of PakWheels to have an idea. 16-17 for X depending on condition and seller, 17-18 for G. The prices have not gone down for these. There are most probably a handful of Axios out in the market for sale and most are 2007-2008 models last imported in 2013. Good luck finding a piece that is clean and less driven in Pakistan.
Pros - very comfortable ride
Cons - the speed breakers we have in Pak, with Axio's soft suspension, full loaded will most prolly hit them.
Fuel economy wise. I have driven it 16k in last year, with avg of 11.45 km/liter. Most in short city trips. Others here get better mileage. @strikerx
Parts availability is not an issue, for the most stuff. But be warned that if work comes up in suspension (shocks) then genuine new ones would cost you 22-35k from local dealers. Kabuli ones 12-15k. KYB replacements cost less than 12k but they would have ??? over ride comfort.