Just like trying to get up there this past weekend, brutal. It's hard for me to be really specific as there are several factors at play. Uphill, downhill, very cold weather, rain and snow on the way up. I would say the roof rack and ski rack with 4 pairs of skis added about 20% to energy usage. On the way home (237 miles from Northstar to San Jose), I can make it back pretty easily on a 90% charge. Last time I did it, I got home with 50 miles of range left. This time, there was no way I would make it without charging. I would have been about 30-40 miles short. Most of that was due to the racks. Some of it I'm sure was due to colder temps.