Then we visited another friend in Lafayette. His kids loved the Tesla! Here's Dr. Matt, another of the smartest people I know.
Finally we drove through the mountains into Silverthorne. It was absolutely beautiful. We climbed to 11000 feet and then drove a 7% grade for 7 miles! Other cars have to ride their brakes the whole way down, but the Tesla just regenerates power for braking. We actually gained 9 miles of range on the way down and never had to touch the brakes. Here's our energy graph at the end. Orange means we were using power, and green means we were gaining it back.