now adays about 10 miles without pedaling. and 20-30 with pedaling. more or less depending on weight of rider, knobby vs slicks, weight of frame, rider position ect.

There are better batteries that would give you about 25 miles without pedaling and 40 with pedaling

the expensive part is the batteries. I preffer these myself though http://www.staton-inc.com/Details.asp?ProductID=2747

not electric but gas powered. they meet regulation and CA's pullution standards and get about 160-220 mpg. the little canister on them will get me about 70miles