The other day I drove down a mountain -- here.... Here's the google link It took me about 6 minutes. I was on highest level of regen and I still had to apply the brakes here and there. After getting to the bottom I had gained 11 miles of range. Thinking of it, that was a helluva lot of kWhs going into that battery quickly. About 4x as fast as a 240 volt charge. Makes me wonder what is the upper level of charge rate that this car's batteries can accept.