I drove till Hunza in May13 on my corolla 07 fitted with CNG, spent a night at Gilgit, then next day went to Hunza till Atabad lake and parked the car back at Gilgit and went to Naltar on jeep and spent two nights their.
Total expenditure on Petrol/CNG with four people on board was Rs 13000 including a return journey, CNG was available till Manshara so around 170 odd kilometers onwards from Manshara were on CNG and back from Manshera till Islamabad was on CNG that?s why was able to reduce traveling expenditure.
With four friends on board and a CNG cylinder, car was little to heavy for KKH highway. That was the lesson I learnt, that it would had been better if I could have removed the cylinder before travelling as pleasure of driving on KKH was gone because of weight and bad roads. Corolla rocks on these roads provided its not heavily loaded.