870Wh one way (a few sprints over 80km/h hurts the average) and 740Wh on the return trip. I tried to average exactly 30mph for the whole trip, and I was only off by 1/2 percent. Covered 34km on the way home for an average of 21.8Wh/km including a few hills, a bridge and short stint at 40-45mph on a section of non bike friendly road so as not to block traffic.