1. Use of residual fuel oil was more common in the past. 2. The unit produces gasoline by upgrading residual fuel from the primary distillation process. 3. Residual fuel oils are cheaper than clean, refined diesel oil, although they are dirtier.4. Residual fuel 's use in electrical generation has also decreased.5. The ISO standard describe four qualities of distillate fuels and 10 qualities of residual fuels . 6. Burning fuel oil, particularly residual fuel oil, produces uniformly higher carbon dioxide emissions than natural gas. 7. The rest of the barrel is jet fuel, petrochemical stocks and the residual fuel used by utilities. 8. Fuels produced at the refinery include gasoline, jet fuel, distillate fuel and residual fuel and are sold on-island. 9. As prices rose, utilities and manufacturers that could switch to burning cheaper residual fuel and diesel did so. 10. Cetane numbers are tested using a special test engine and the existing engine was not made for residual fuels .
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