
The Hyundai Exter CNG offers the best mileage among affordable sunroof cars, achieving 27.1 km/kg. The Tata Punch CNG claims approximately 26.99 km/kg, and the Tata Altroz CNG provides up to 26.2 km/kg.
It is likely that more budget cars will include sunroofs in the future, as manufacturers are increasingly offering them in more affordable models.