Found some info from late 2018, but paywalled and incomplete, focusing on oil wells. https://news.stanford.edu/2018/08/30/measuring-crude-oils-carbon-footprint

Found some info from late 2018, but paywalled and incomplete, focusing on oil wells. https://news.stanford.edu/2018/08/30/measuring-crude-oils-carbon-footprint/ https://news.stanford.edu/2018/08/30/measuring-crude-oils-ca... https://science.sciencemag.org/content/361/6405/851.summary https://science.sciencemag.org/content/361/6405/851.summary Older data from 2013 regarding tar sand production is much worse https://insideclimatenews.org/news/20130219/oil-sands-mining-tar-sands-alberta-canada-energy-return-on-investment-eroi-natural-gas-in-situ-dilbit-bitumen https://insideclimatenews.org/news/20130219/oil-sands-mining... Then, in the end, general refineries have ca 85% energy efficiency for petrol and diesel, discounting other factors.