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Originally Posted by Sledge
...A carbon-fiber Daihatsu UFE-III body, a 0.5L common rail diesel engine, a BMW Turbosteamer regenerator, a Toyota HSD drivetrain, a plug-in-able lithium sulfur battery pack, and some triple-junction solar panels on the roof 
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That is about as good as it gets.
I think this could get tweaked a bit with an enhanced IMA that would allow limited EV mode and a 6-speed transmission.
If you opted for an extreme measure, replace the two rear tires with just one....