I have over 400 km on my Kymco now. I did the crankcase and rear gear case oil changes just last week.
On my second fill up I got 99 mpg.
On my last fill up I got 109 mpg.
This is at mostly steady 30 mph driving. I'm going to put the overdrive clutch bushing in it as soon as I can and see how much extra speed I get and what it does to the fuel economy.
ADDED 9-2-2008:
The last two fill ups I got 109 mpg and 107 mpg.
I still don't have the overdrive clutch bushing in, not sure if I'll get to that this year.