For ultimate fuel economy I would build something like an Elio, but my preference would be for a 4 wheeler for the sake of stability. My thought was to have the narrow tandem cabin, with fully enclosed wheel arches outboard of the body of the car, and a low sill stretching the length of the car from front to rear wheel arches, enclosing possibly fuel tanks and/or batteries depending on whether it was going to have an ICE, electric or hybrid drive. The engine would be at the front, as with the Elio.
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Save fuel by treating it - costs 5c/litre, save 15c, it's a no-brainer. Message me for more information.
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