Obviously the pick is not that good when there are 4 persons on board with ac, but only once a week ya kabhi kabar 10-12 din k baad kahen 3-4 banday beth jatay hain. As its always used by 1 person. But still if only driver is in car the ac effects the pick.
When i changed ac compressor, unfortunately iwas not there, but the ac compressor is of other car, the cooling is very good in long routes as i mentioned, plus i onl use full blow when there are more then 2 persons in car, rest the blow is always low.
At thay time its costed me 12 k, comprssor, ac gas labour etc.
Last month i spend another 4k on ac.
So ive spended alot on ac, its giving me good responce.
Last month i also serviced the radiator, iwas willing to replace, as i replaced my other car radiator as well, but when i looked at the temp guage there was no problem at all, and with the radiator as well, so ended up with radiator service only.
Till now, i havent used any sort of coolant in khyber, its simple water, but planning to use a coolant.
Yup, the cng avg is good now adays, its running 65km daily long route(32.5 going and 32.5 back)
So a full tank is covering almost 3 trips for me.
In almost 800rs cng its giving me 200kms. (Almost)
Jusy sharing 
I have a mehran 2014 euro2. (Non ac).
Mehran is giving me 250kms in 1000rs petrol on 14inch rims 