I built a single-seat electric car out of aluminum in high school, and the frame probably came in at 10kg. The lead-acid batteries, motor and controller were a significant portion of what I estimate was a 100kg total weight. It had no suspension and used custom made bicycle wheels...
Anyhow, I'm never impressed with 2-seater cars. I can get 60mpg on my CBR600 and transport just as many people and cargo. I can do all this for $3000 and have 110hp to play with. For less money you can get a Ninja 250 and get 100mpg.
Neat to see the design process, but car of the future; certainly not.
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