Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_66 ( diameter__km_ VARCHAR, diameter__mi_ VARCHAR, gill VARCHAR )

### Question ###
What shows for the Diameter (km) when the Diameter (mi) is 8mi, and a Gill is e?

### Accurate SQL ###

SELECT diameter__km_ FROM table_name_66 WHERE diameter__mi_ = "8mi" AND gill = "e"