Which is more efficient as a fuel source: ethanol, coal ...
May 21, 2017· Which is more efficient as a fuel source: ethanol, coal, natural gas, or oil? Update Cancel. ... SOx and NOx emissions requires some pretty heavy duty pollution control equipment to say nothing of the GHG emissions. ... Ethanol is the worst of the lot you've listed in terms of energetic efficiency; it is energymarginal, meaning that most ...