For a start, I would like to advice that as per my review title, every child is unique and so is every bike.just a few basics out of many, before buying a bike is that, check the spares availability by window shopping at stores nearer to your residing area or frequently visited market area. Just have a look at mechanic shops and have a word with them about your selected bikes over a cup of tea, tell them that you are looking to sell(not to buy) that particular bike and how would they rate it, you can ask them about the price of spares, about actual mileage that they can set for that bike etc.believe me you will come to know a lot.
Lastly, my main reason to enter this thread is to suggest that keep yr fuel meter in working condition always as there are lots of thefts at petrol stations. Thinking that your bike has suddenly dropped the mileage, you might eventually end up spending a lot more, trying to fix a non existing problem. Stay alert at petrol stations and make some sound if you feel anything fishy happening to your hard earned money.
See you soon.