Manual Push Mower (Great States 815-18)

The Great States 815-18 manual push mower is the definition of energy efficiency, as it requires zero fuel or electricity to operate. It is a quiet, low-maintenance tool that is perfect for small, flat lawns. However, it is significantly less efficient in terms of human labor and time compared to gas or electric mowers. It struggles with tall or thick grass and requires multiple passes to achieve a clean cut.

It is ranked low because, while environmentally efficient, it is physically demanding and time-consuming for the average user.