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[spelunker]

If I plug my 2013 S's charger into a 220V circuit, will it charge in half the time?  The specs say 120V or 220V.

[protomech]

No. The 2013 S should pull around 14A @ 110V or around 7A @ 220V from the wall.

[spelunker]

So, I can charge it for half the cost at 220V.

[protomech]

If you pay for electricity by the amp-hour (regardless of 110V or 220V) then yes.

If you pay for electricity by the kilowatt-hour then you will pay the same regardless of 110v or 220v. (Not entirely true, 220v may be slightly more efficient.. but we're talking 1-2% here)

[trikester]

If you pay for electricity by the amp-hour (regardless of 110V or 220V) then yes.

If you pay by the amp-hour then you would be damn glad that the charger is Power Factor corrected!

[NoiseBoy]

If you pay for electricity by the amp-hour (regardless of 110V or 220V) then yes.

If you pay for electricity by the kilowatt-hour then you will pay the same regardless of 110v or 220v. (Not entirely true, 220v may be slightly more efficient.. but we're talking 1-2% here)

Over here you can buy voltage reducers that drop mains from the average of 240 down to 220V which saves a fair bit of money each year apparently.  Most appliances draw less current at a lower voltage, i don't know the science behind it but a lot of large businesses use them.