strange thing in new mehran 2013 euro car .....each time i open the fuel cap to fill fuel its like air is inside the tank and there is always this sound of air gushing out .
2ndly its a brand new car , i filled fuel worth rs.3000 ---so basically with its small engine it should run min 400km+ but right now the mileage shows 300km and the needle of fuel has gone down all the way .its not at the end now i think a further 30kn might be achieved but is this due to the reason there is air inside the fuel tank .
or it was not filled properly - i know for sure that i saw petrol being filled till the top . i could see it --if that is the case then it means fuel was full .
I agree with cooldevil. New cars tend to burn more fuel during the break-in period. It is perfectly normal. Drive with a light foot up to until 5000 kms. And you'll notice the difference. If it doesn't change, then you may require tuning. Be patient up to 5000 kms.