Tesmotorfaqcom
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In California, to compute electric rate is actually very difficult, for EV drivers that opt for time-of-use your overnight rate decrease but daytime rate increase significantly, SCE have multiple TOU plans each with different rate not to mention the summer and winter differences. So if you are looking into cost saving, it might not be as much if you factor in vampire drain and charging efficiency. But it's still cheaper than filling up at a gas station.