Any idea how many wh per mile you get ? Just bought a power meter to monitor usage depending on terrain. On a very old Bionx 250w rear hub drive, I use 5wh per mile on a flat route at power assist level 2 (50% assistance). On steep climbs where I would use level 3( 100% assist) and level 4 (200% assist), I would average about 20wh per mile. A power meter is an accurate way of gauging efficiency.