This is a good point, I debated whether to express things as EROI instead of efficiency. Brazilian ethanol is estimated to be about 8:1, corn ethanol is less t

This is a good point, I debated whether to express things as EROI instead of efficiency. Brazilian ethanol is estimated to be about 8:1, corn ethanol is less than 2:1. According to a Wikipedia a 2015 metastudy for solar PV found between 8:1 and 40:1. https://en.wikipedia.org/wiki/Energy_returned_on_energy_invested https://en.wikipedia.org/wiki/Energy_returned_on_energy_inve...