Thought I would chime in with a 150 kilometer update. All is well! Bike has performed pretty much as I had hoped as far as range and top speed. For most of the rolling hills around here and some dirt trials mixed in with the ride I am averaging say 5ah for every 10 kilometers traveled. That is pretty much pinning it with some pedal assist as I like to get some exercise while I am at it. Being a direct drive single speed HUB motor the low end suffers a bit and things seem to be happier in the 20 to 50 kilometer range. This being said I am still glad I went with the HS3540, it is very cool to be able to go 30MPH with a DH bike running knobies. Good thing I am running a 24inch rear wheel to help a bit on the slow speeds for hill climbing in the trails. So range is about 40 kilometers with my 48v 20 ah of Lithum Manganese unless I have big climbs. I tested the other day with about an 800 ft climb on switch back single track and it ran good. Had to pedal on steeper terrain but there would be no way possible to climb this trail with out the electric motor pushing me onward. It was cooler out, so no overheating of the hub it seemed just warm to the touch.
All in all, the electric experience has been awesome and has more than meet my expectations. Big relief really, as I had never ridden an electric bike before and was just going by what I had read on this forum and was hoping it would all work out. I hope to make a short video of the bike riding the local trails here when a friend comes up this way with his camera.
Thanks again for the help along the way from those that have paved the way for those of us just getting into this.