I'm sure this question has been posed many times. In googling for an answer I found a thread on Reddit that provides some good info, but not exactly what I'm looking for. I am interested in getting an idea of the recovery rate in say the following scenario: You are driving up a 1 mile long hill with a 5% grade at 45mph. These are just example numbers. When you reach the crest you drive down the 5% grade hill for 1 mile at the same speed. So, if using enough just enough regen to not slow the card down to under 45mph (assume no actual use of brakes), how much of the power used to get up the hill is put back into the battery?