The following is totally unscientific and (as always) YMMV. We just returned from a trip to the mountains and while there I noticed an interesting phenomena. We arrived at Roan Mountain State park in Tennessee with just over 50% charge. Since there were no charging facilities available we did all our driving in HV. When we left the park two days later our charge was just under 100%. We had two drives to Johnson City, TN which were each about 30 miles that did not seem to have any appreciable in charge however what did make a difference were our three trips to Carvers Gap. The trip from the State Park to Carvers Gap is roughly 8 miles with about a 2,500 foot elevation change. The speed is 40 but the nature of the road means much of it is driven below that speed. On the way up the mode was constantly switching from using battery assist to ICE only and the bees were present (I did shoot a video of that). On the trip down we basically used the regen paddles to control our speed in all but the sharpest curve. It was clear to see on the battery display the increase from each trip. So, at least on this particular road less battery assist is used getting up the hill than regen is available coming down. Although not surprising that there would be a net gain I was surprised that 24 miles over two days was enough to see a difference. Now time to prep for Florence which is making a beeline for Raleigh. Good luck and safe travels for anyone else who has to deal with this one. geo BTW I knew I could charge in Boone, NC so I made good use of my gravity powered battery!