The Americanized 1970 Subaru 360 Sambar van gets around 50mpg highway
However it’s too speed is limited unless you do a sedan gear swap and it’s best to do some carb tuning and swap in an electronic ignition
But it requires steady but simple maintenance, whole car can be tore down with under a dozen tools but old school cars had a different maintenance schedule
The good things are that you don’t need to do oil or coolant changes.
I would question that a non-specialized kei car would not fit your cargo
That said some have tried to gas swap miles zx40’s and possibly a kei truck with a specialized box might work
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