I don't know who will take note of this bike, I don't find it exciting.

You need to check your gear sprockets , they must be damaged or may be simply something is loosened inside gearbox in your bike .

I don't have experience with this car but you should see your mechanic or rather service center asap as you said its a new car, it can be sign of some upcoming big fault. So don't ignore it and take action asap.

How do you know it used up 2 Ltr of lubricant oil , did you measure it ?
Do you see excessive smoke coming from exhaust or preferrably black smoke?

If yes, then may have sticky rings or may be your engine is doing and looking for a bore, you may try oil viscosity enhancers and see if it helps as sometimes such small efforts helps a lot.

If you want to feel its power and wants to go off-road often then manual is best however if you want to drive it in city as well its only for showing off then go for Automatic as driving automatic is very pleasant and non-intruding.

Hmm.. Its not yet launched but will definitely give a tough competition to Etios, Dzire .. I don't know how Manza came in list.. Manza is not a compact sedan.

Well, it can be true because you can see that new compact Quanto from Mahindra is has received very good response in the market and it looks pratical too. Even international trend is of compact SUV picking up from quite some time.

There are various models of A7 and A6 , as per news I can find out , its 26.2 mpg in city and striking 42.8 mpg on highway. And one gallon equals 3.8 liter . So from Indian context, its not really a good mileage.