Looking for a new hobby project? You can get plans to build this futuristic-looking, 225-mpg XR3 hybrid tricycle for only $99. It's supposed to go 80 miles per hour. Watch it in action on YouTube here.Actually building it will cost you another $7,500 to $25,000, depending on the options you choose. But its inventor, Robert Riley, has plans to bring the thing to production soon.Via Gas2.0.
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