Tiago experience for 01 year (very poor millage compare to company's commitment)

Port Blair, I have purchase a Tata Tiago Revtron XZ manual on January 2018, running around 7500 km, Pros: it's look is no doubt very pretty, specious, smooth in driving. Cons: engine noisy, and important things is that fuel economy as mentioned by the company is 23.80 kmpl but actually it is given only 12 to 13 kmpl, i talk the matter with service section but they are unable to redress the problem till date. apart from that coming some body / door sound that also not redressed till date. Narayan