A friend of mine has homes in Silicon Valley and Indian Wells (Palm Springs area). He regularly travels between the two locations. He has done some calculations and seems to get almost 90% energy recapture. He reported this to me in early October after making the trip in his P85:
"...Tejon Ranch at the base of the Grapevine and then up over the Grapevine to Indian Wells for a total of 209.8 miles. We charged to a rated 262 miles at Tejon Ranch...The long last leg over the Grapevine was traveled with the cruise control set to 65mph and the average consumption was only 266Wh/m. We arrived in the garage with 61 rated miles left."
I made the same trip but in the opposite direction from his house a little over a week ago. We fought strong headwinds and had the cruise control set to 68 mph. We left Indian Wells with about 250 rated miles, and arrived at Tejon Ranch with about 15 rated miles left. I'm sure we had the cabine heat set to 68 degrees, but I don't recall the temperature that day.
But I sure learned a lesson about wind!