It's a gyro-copter. So not a good example of the principle, a fixed wing aircraft would be more efficient. As an example to disprove the rule, the Grob G 109

It's a gyro-copter. So not a good example of the principle, a fixed wing aircraft would be more efficient. As an example to disprove the rule, the Grob G 109 motor glider[1] goes 1500 km (vs flying car 1315 road range) on the same amount of gas while probably going faster (180km/h economical cruise). [1] https://en.wikipedia.org/wiki/Grob_G_109 https://en.wikipedia.org/wiki/Grob_G_109