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This part got me as recently in this same community I blieve someone was talking about diesel and a couple of us were talking about the roi of it. I was saying 3 to one might not be to bad because I know its close to tar sands but maybe I am wrong if what he says here is correct:

"The threshold for maintaining industrial civilization, according to biophysical economics research led by Dr. Charles Hall at SUNY, sits at approximately 10:1. Below this ratio, an increasing proportion of gross energy production must be reinvested into the energy system itself, leaving less for the broader economy. At 3:1, oil extraction becomes energy-negative for non-transport applications—you burn more energy extracting and refining the barrel than the barrel contains."