The Citroen Aircross has a turbo petrol engine, so relatively lower mileage is not surprising. In our tests, the Aircross returned around 9.5 kmpl in city conditions for both the manual and automatic variants. For reference, the Kia Sonet, which is similarly priced but smaller in size, returned around 11.5 kmpl in the city, giving it an advantage of almost 2 kmpl in efficiency. The main reason for that is the Aircross’s larger size and weight.
That said, since our efficiency test was carried out in Mumbai, in cities with more free-flowing traffic, you can expect a bit more mileage from the Aircross.