Windmill Tile
Windmills can produce food.
To be able to do that, they need wheat tiles in their vicinity.
Additionally, one wheat tile can only support so many windmills.
Try spacing the windmills further apart to avoid efficiency loss.
A windmill inside a forest will not get enough wind to work properly.
Nerdy Details
$$f\_reg = \min\{1,\frac2m\}$$$$x = 2 * w * (1 - (f * 0.5))$$
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f: Number of forest tiles adjacent to this one -
m: Number of windmills in radius 3 around a given wheat tile -
f_reg: Quotient of the number of windmills in the neighborhood for every wheat tile -
w: Sum of allf_regvalues of the wheat tiles in radius 3 around the windmill. -
x: Production rate