This Saturday I had a round trip to Islamabad from Peshawar. At Peshawar I filled CNG for Rs 700. That was good uptill Islamabad and for travel within Islamabad. total Kms covered were 211. As their was no CNG in Islamabad I filled up for petrol for Rs 1500. Back in Peshawar I was left with petrol that was before filling in Islamabad. So total fuel consumption was 700 for CNG and 1500 for Petrol for a journey of about 430 Kms. Is it reasonable?