I calculated that my leaf is using about 11% of my total KWH and am presently on E1, charging whenever I feel like it. E9A is not for me, would cost me more. According to PG&E, I would save $90/yr on E6. They are going to do a month to month analysis for me for the past year showing what I would have paid on E6 compared to E1. If I moved to E6, I would charge at night. I'm curious if any one else is on E6 or looked into it. Yes I know, I should be charging at night anyway, and I may start doing that now that I'm used to the car, timers, etc... Our monthly usage is roughly in the middle of tier3.