Hi DaBinChe. Nice to see a familiar name over here from TR.
I have nearly 600 miles on mine and have been tracking the mileage from the very beginning.
It has held a steady 100 mpg with normal use during the break in period. My average cruising speed is 45 mph.
So far the rear tire is holding up well, but the stock front is awful. The tread pattern is a set of grooved straight lines around the tire and it tends to follow cracks in the road as you ride. Annoying. My friend and I have already bought replacements for the front that nearly match the rear and they handle noticeably better.
http://www.motorcycle-superstore.com/5/32/404/11893/ITEM/Michelin-Gazelle-M62-Moped-Tire.aspxI have the bench seat but not the cargo rack. I am unsure if they if they will work together.
Storage is definitely a problem. I am used to having at least someplace on the scooter to stash a few items. The Symba has nothing unless you add to it. I am not really interested in the hard or soft side bags, but I have to find something.
Hope this helps.