Here are the best options ull have in the budget for good mileage and low maintenance.
1. Ritz Vdi
2. VW Polo
3. Ford Figo TDCi
4. Swift Vdi
IMO take out swift, out of the options beacuse :-
it rattles A LOT, rear seat cramped, old model, poor build quality, very common
Now its b/w options 1, 2 & 3
VW Polo is new. I went straight away for a testdrive of the polo petrol. Oh my god, what a disappointment. The petrol engine was even louder then most diesels out there.
The drive was very shabby and the pickup was aweful.
Pros are good looks, uniqueness, decent build. Period.
Your main contenders would be figo, ritz.
These are the best cars in this budget.
Figo v/s ritz :-
1. Both cars are well built, but figo has the edge.
2. When it comes to pickup, you cant compare with maruti ddis. Its got so much evident torque.
3. Ritz has got better drive ability.
4. Both cars offer good high speed stability and handling, but figo is ahead with a v small margin.
5. Low maintenance cost in the Ritz. Ford parts are generally costly when compared to marutis.
6. Larger boot in the figo
7. Rear seat spacing is a bit better in figo.
8. The interiors of Ritz are far better.
9. Plastic quality in both seem to be decent.
10. Easy availability of parts for the ritz.
11. Better fuel ecenomy in the ritz, but not by much.
12. Looks - Ritz looks good from the front and side. But rear is a bit subjective. Whereas figo has average looks.
IMO, you should go for the ritz diesel, eyes closed, if you are looking for better fuel economy and low maintenance as main priorities.