The Mazda rotary range extender sounds intriguing, given it's small size, smooth running, and efficiency.
What kinda blows my mind is that gas is one of the most energy dense fuels around that is plentiful, and yet the best we can come up with to extract that energy is blowing it up. I've read about a few fuel cells, but not a lot of progress on them. Maybe one day someone will find a better way to extract that energy that would be much more efficient.
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