Hello
Given your budget you have a few options:
Toyota Vitz 2016 (Reconditioned), Toyota Aqua 2015, Suzuki Swift RS 2017 (Brand new).
If fuel economy is your main concern, of course, go with the hybrids.
If the battery in a hybrid needs replacing It will set you back about 3-4 lakhs.
In my humble opinion, I think its wiser if you go for a newer Vitz or Swift since they offer decent fuel economy as well ( about 14-15 km/l)
good luck!