None of the cars you have shortlisted have Level 2 ADAS, within your budget of Rs 15 lakhs. Since this is a must-have, you may consider the Tata Nexon, which satisfies all your requirements. It includes a 5-star crash safety rating, ADAS, tyre pressure loss indicator, sunroof, cruise control, and its boot space is quite respectable too. Also, the Nexon feels tough, and its ride comfort is very good for your city and highway drives. 

If you are comfortable with sedans, then the Honda City and Hyundai Verna meet all your requirements, and have a much larger boot than all the compact SUVs on sale. Between the two, the Verna feels more modern, and is a bit more refined, too.

That's a very varied set of cars in your shortlist, and it would be hard to pinpoint one without knowing your specific requirements. The Mahindra Thar is a good option if you want a rugged SUV to take on bad roads. If you really like the image, if not its not better than the others as a daily driver, as the ride over medium bumps and patchy city streets is very busy.  Also, the refinement, too, will not be as nice as the Honda City in particular. 

The Tata Curvv will be more refined than the Mahindra Thar and will feel more premium inside, too. Plus, it will have sufficient ground clearance for most bad roads in and about the city. So this is a good buy if very rough roads are not something you encounter. 

The Honda City would be best if you like to drive, as the handling of a sedan will feel better than the Thar and the Curvv. Also, we assume you live in an area with reasonably good roads. 

Sadly, there are no all-new Rs 25-30 lakh sedans lined up for launch this year. However, slightly lower down the price ladder, we will see the launch of updated versions of the Hyundai Verna, Honda City, Skoda Slavia and Volkswagen Virtus over the year. 

There's way more choice for the same budget in SUVs with options spanning petrol, diesel, hybrid and EV powertrains as well as with two and three rows of seating, and 4x2 and 4x4.  

Unfortunately, there are very few sedan options available today, and between Rs 20 to 30 lakh, you would only find the Honda City Hybrid. The City will meet your requirements of good mileage and low maintenance cost, however this variant isn't really value for money at all. 

Thus, we would suggest you consider the Hyundai Verna instead. The car may not be as fuel-efficient as the Honda, but it is efficient enough. 

We put the 1.5 litre turbo petrol auto through our standard test cycle, and it returned 10.76kpl in the city and 16.05kpl on the highway. The Verna is also well equipped and offers good value, and will be reliable and low on maintenance costs. It also secured a 5-star rating in the GNCAP crash tests.