Yes, turbo petrol engines, especially when paired with an automatic transmission, tend to be quite thirsty in city driving. This is because the turbocharger frequently spools up to provide boost, which increases fuel consumption. Turbo petrols are also very throttle-sensitive.
With gentle driving, your MG Hector can return reasonable mileage, but slightly enthusiastic inputs can quickly pull the figures down. If fuel efficiency is a concern, you could consider a naturally aspirated petrol engine, which is generally more efficient and consistent in everyday driving conditions. 
