I ride a bike to work most days. From 1974 to 2003 the trip was usually three miles one way, but then the office moved to make it a seven mile trip. I found a route without too many hills and I kept on biking, but I started getting more intersted in an electric bike.
I bought a used Wildernessenergy bike in September 2007 from someone who was not usimg it.
It worked OK but seemed to run down just at six miles. Maybe the battery was not charged enough, maybe it preferred people under 160 pounds, etc., etc.