Changes

Each use of a hoe uses some of the player's daily supply of energy (visible in-game in the Energy Bar display). The base cost of one tool use is two energy points.

The player's farming skill increases proficiency in use of the tool, and that skill is reflected in a reduced energy consumption with each use. The reduction is 5% (one twentieth) per skill level. This means that at skill level 5, the reduction is 25% (one quarter), meaning it takes 75% (three quarters) as much energy as the base to use the tool once: 75% of 2 is 1.5 (one and a half) energy points per use. The game does not display fractional amounts, and rounds to whole numbers there, but it retains the fractions internally, so two tool uses cost 3 energy points instead of 4, even if that is not always immediately visible precisely. At farming skill level 10, then, the reduction is 50% (one half), meaning it takes only the other 50% to use the tool: one energy point per use, the smallest cost available.