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_22 (supercharger_gear_ratio VARCHAR, octane_rating VARCHAR)

### Question ###
Which supercharger gear ratio has a Octane rating of 68?

### Accurate SQL ###

SELECT supercharger_gear_ratio FROM table_name_22 WHERE octane_rating = "68"