Question: what is the difference between number 1 diesel and kerosene?
Answer: Kerosene is a lighter diesel oil than #2, hence why it is designated as #1 diesel. The lighter weight means it contains slightly less energy – about 135,000 BTU per gallon vs. ... Kerosene doesn't contain very high levels of aromatic compounds; they typically get concentrated in the #2 and heavier diesel fuel oils.