It gets about three time the mileage when driving compared to flying - a small reminder of just how energy efficient it is to let the normal force from the ground hold something up compared to expending energy to do so.
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).
