about 100mpg and 60 mph is average I guess, people used to say that they got 70 out of them but you need to bear in mind youthfull exageration and the fact that the bikes were always a bit fragile - hence the non matching engine in my 56'er.
It's best suited to the "B" roads here - country lanes with little or no sidewalks, twisty bits that allow you to plod along.
I guess that a modern scooter or 125 would thrash it but that's not the point of a cub
The book goes from the first generation through to the last, it's really very good. Not exactly a riviting read, but every change is menationed and a decent selection of photos. Having said that, I read it while watching Tv one weekend and keep dipping back
loads of detailed lists of the various changes and options.
This may be usefull.
http://www.managethecontent.co.uk/bantamcub/links.htm
I don't like the looks of bantam Cubs but each to their own..
It's amazing what you can find with patience and Google.
If the 59 proves to be a nightmare to restore, I'll maybe turn it into a trail style but if most of it's there, I'll do my best to keep it original.
Hope that yopu find one local to you. I'd suggest that you get a parts book asap (once you have a bike!) as the part number is really useful when searching for bits.