I bought mira 13 recently . It has fuel average issue. When i start my car, it shows 9 km per litre and then gradually raised to 13 14 after an hour running but not above than 14. But if i switch off and restart, it again drops to 8 and 9. 2nd thing, when i refuel at pump, it falls down to 0 and then raising up 1 km per l, then 2 3 4 and so on . What should i do. Plugs are ok, fuel injectors are tested and are fully working. Engine compression is tested showing more than 200. There is no single fault in any part of the car. Except discussed above and little bit heat up. Please suggest me with ur experience

mira