My answer:
1) It's a Toyota, maintenance should be less than Myvi. Replacement part will be slightly expensive than a National made.. Not much different for me.
2) I'm not sure about the FC on a VIOS. But a full tank on a MT Myvi can give u 400KM +, an AT give u less mileage (around 350 or less).. But i think VIOS can fetch u a good FC than a Myvi, it has the VVTI technology which can help to save fuel. And it has higher engine displacement than a Myvi, give you more power @ lower rpm compared to MYVI.
3) I think those are the best choice within your budget.
4) I'll prefer to buy a car at the end of year, because car price drops every month/years.

Answer to your preferences:
1) Honda City IDSI give u the lowest FC compare to those on your list.
2) When it's the time, you'll realize that Sedan is far more better than a hatchback. (More spacious, can carry more luggage/thingy, much more stable?)
3) You should prepare at least 1k for a year maintenance fee. IF comes to replace those tyres, you'll definitely needs more than that.

the 1.8 engine is actually sourced from renault but mated with the 4 speed auto gearbox from mitsubishi. Its like mixing croissants with wasabe so the results is disasterous. The waja 1.8 is prone with problems so that explains why it is cheaper than 1.6 in terms of used car value.

Therefore, avoid the 1.8 like a plague and go for the 1.6A instead, hopefully the mitsubishi engine one not the campro (per 2005).

Anyone know if the banks are planning to raise interest rates in the future? Both for new and used car loans?

The sales person has been pushing me to place my booking saying that the interest rates will go up this week but I try not to believe sales people all that much, I used to be one too.