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How's this for a thought...
Battery trailer. And a small home solar array. Solar slowly charges battery trailer...for free. When it is fully charged, you use it and get XX free miles of driving. And when you need it for a longer trip, you remember to plug it in the day before, so it's fully charged.
Said trailer could have a small generator on it, in case you need even MORE distance.
The question is...could you gather the materials cheap enough to make it worth the effort?
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