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> Cycling is still the most efficient and affordable way to get around.

It is, if you live in a flat place, don't have small children or buy anything from ikea. It is only good for you travelling from place A to place A or B assuming that when you get to place B, you can have a shower or don't need it.

Gasoline cost? I expect a flight in a helicopter like vehicle to be more expensive than using wheels to counter gravity.

About the accident risk, perhaps real 100% autopilot may solve that.