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I don't think any "kit" that you can put on any normal car is going to get the job done; this is not something that a wacko with a so-called 100mpg miracle carburetor is going to succeed with.
The "3-litre" (i.e. per 100 km, not displacement!) version of the VW Polo 1.2 TDI (or Audi A2 TDI) is probably the closest that a 4-passenger production vehicle could be to achieving this. A Prius will not do it. A Japanese kei-car with a gasoline engine will not do it. Pure electric cars will probably have trouble with the daily-driving and long-trip aspects of the testing.
Achieving this requires something with attention to aerodynamics, light weight, small engine that is as efficient as possible, maybe hybrid powertrain (or maybe not).
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