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You need compare the whole system: internal combustion engine plus the gas tanks to feed it, versus an electric motor plus batteries.

The energy density of batteries is far worse than gasoline. Also, after you burn gasoline, you don't have to carry it anymore, which isn't true for batteries.

Also consider that for a plane, running out of gas can be fatal, so you can't actually use all the range. There needs to be a safety margin.

And then, consider that a practical flying car can't actually take off or land like a plane, and probably can't have the wingspan of a plane, so you might want to compare to a helicopter instead.




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