Anaerobic Digester Nerf

Anaerobic digester converts 4 food into 16 fuel. This allows three irrigated farms to comfortably produce food and fuel (using gas boiler) for a population of 350+. If this process is intended to approximate the following: C6H12O6 → 3CO2 + 3CH4, then (at best) the process should yield no more than 12 fuel and produce an equal amount of CO2 pollution.

Of course, in reality, this process is a complex, multistage system (hydrolysis, acidogenesis, acetogenesis and methanogenesis) that costs much more than the trivial 10 power the game charges. It's a very cool and interesting inclusion, but the costs seems trivial for the outsized benefits it gives.