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How much does it cost to charge a Tesla at home on average?

Electric prices in the US vary from around $0.07 per kw-h to over $0.20 per kw-h, so charging cost will vary that much too.

For the largest Model S battery (100 kw-h), the math is real easy, ~$7 to ~$20. They say 300 miles range for that battery.

I think your max price is a little low. In California PG&E territory the top tier costs $0.40 per. If you have the EV plan it can cost up to $0.44 during daylight hours in the summer.

I managed to say over $0.20.

I think using what is basically a penalty rate that an electric vehicle owner agrees to in order to get cheap overnight rates as the max would also be a mistake. Those customers pay ~$0.12 to charge overnight.

I wonder what % efficiency the charging is?

Good point. Apparently 85%.

http://teslaliving.net/2014/07/07/measuring-ev-charging-effi...

(bumps the numbers to ~$8 and ~$24)

Rule of thumb is about half that of gas at current prices assuming you're doing a mix of night and day charging. Perhaps up to 1/3rd if you do exclusively night charging with reduced rates, assuming your local electric utility offers reduced pricing.

So maybe $1,200 saved annually compared to gas for average use.

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