I have purchased new Ertiga just a week back. It is CNG version I found that when I fill CNG the gauge at dash board shows full reading. After driving the vehicle few kms. On next morning the reading on the gauge shows less. The same thing is happening when I park the vehicle at the office. Can I know the reason for lowering the CNG level in the tank?
It may be a manufacturing defect in your CNG measuring gauge that it would be showing wrong indication. You can consult your Maruti Suzuki dealer and he will get it replaced for free. If the problem is with the CNG kit, the same will be done and you may get the problem fixed.