Brother I already expressed in detail Quetta Qila Saifullah Zhob and DI Khan Route facilities.
U will just found CNG in Quetta ( PSO opposit Askari Park, and AWT CNG on Zarghoon Road and DIkhan next CNG station is in Chasama and in Mianwali.
If U take route Quetta Sibi then U will found CNG in Shikarpur -College Road (Shahrukh and Asakri CNG ) then next u will found in Sukkar ( Madina , Taj, Attock, Hayat CNG Nawaz and Mashallah CNG Etc.
Also U will found two CNG in Kashmor Teshil as well.