I purchased discover 100 cc on Nov. 2012 and regularly using it for 50 km per day with the speed of 50-60km/h. I find this bike the best for me as a fuel efficient and powerful bike.
Their is a little drawback also that when i tried to run this bike on 70-80, it make noise from engine and bike forced me to be in my limit of 50-60km/h
I am happy with this bike because of its mileage of 85km/l