user: Question: Which supercharger gear ratio has a Octane rating of 68?
Columns: ['Engine', 'Power, continuous', 'Power, takeoff', 'Compression ratio', 'Supercharger gear ratio', 'Octane rating', 'Dry weight']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Wasp Jr. A', 'hp (kW) at 2,000 RPM', 'same', '5.0:1', '7:1', '68', 'lb (kg)']
SQL:

assistant: SELECT "Supercharger gear ratio" FROM "Table" WHERE "Octane rating" = '68';