If I set out to build the most fuel-efficient daily driver possible on a budget of $20k (which I might well do in a few years), it would look very, very much like the HyperRocket.
I really doubt you could build your own for less than he's asking, but a vehicle like this has never been about saving money.
If it were mine, I'd add Aptera-style wheel fairings. Tires are an aerodynamic disaster.
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