do oxygenated or non-oxygenated components of gasoline have the hight boilling points?

Answer 1

All the oxygenating compounds added to gasoline have much lower boiling points than gasoline itself. This suggests that oxygenated gasoline will have a lower boiling point than non-oxygenated gasoline. Not that any of them reach that point much - they're all volatile and evaporate readily at room temperature (like gasoline itself) creating highly inflammable fumes, and when they're burning they just shoot well past that point!