Cool article. They somehow got the formula wrong though, the formula on the screenshot has an additional factor of 0.9 that accounts for the fact that 1l of oil

Cool article. They somehow got the formula wrong though, the formula on the screenshot has an additional factor of 0.9 that accounts for the fact that 1l of oil is not 1 kg. Perhaps it's intentional, but for something so simple I don't think it needs to be dumbed down even further.