i remember making one trip on petrol when my CNG settings got disturbed once. i got the 15.4 km per litre at speed nearing 90.
at 80kmph i get slightly higher mileage. 160 km max from 55 kg cylinder. n so the max economy speed for my car is 100.
ur car has five gears so u can expect more from it. not the mileage at 110kmph and report.