Good car bad milage

Everything else is good except the fuel economy of petrol xm variant. Being 6 feet in height I find it difficult to get inside (driver'seat) Harman music system is awesome. AC works fine, spacious, deadly looks. [Forgot to mention; after 4 months of purchase of nexon I frequently receive phone call from tata motor that I took a test ride few months ago and what is my plan to buy the car.]