How about just closing the garage and let the motor run.
Many die that way, usually unintentionally, but it is quite cheap.
What do you do if you have a Prius? The battery will die before the owner does.
“What do you do if you have a Prius?”
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Well, in that case, you probably live in San Fransicko, so you try to jump the rails of the Golden Gate bridge, or fisherman’s wharf.