Question is in title. My searching is actually rather disturbing this morning as the results are fillled with industry fud and not what im looking for. What im really trying to find is a graph of oil produced historically because I recall we used to get something like a 50 barrel return but now we get single digits.
I think they mean all the gasoline/oil/energy consumed by heavy machinery like refineries, tanker ships, mining derricks, drillers, prospectors, etc. to manufacture one barrel of finished oil.
Edit: found the term OP is looking for: energy returned on energy invested (ERoEI). It used to be “18 to 43” for conventional oil drilling, but can be as low as 1.5 for the new oil shale extraction, due to needing to burn large amounts of methane gas to heat the ground to free up the oil.