Can unleaded gasoline be used in an engine made for regular gasoline?

No, unleaded gasoline should not be used in an engine made for regular gasoline. Unleaded gasoline has a higher octane rating than regular gasoline, which means it is less likely to cause knocking in an engine. However, it also has a lower energy density than regular gasoline, which means it will not produce as much power. In addition, unleaded gasoline can damage the catalytic converter in an engine that is not designed for it.