Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the highest effic with an avg/g of 91.9?

### Inputs:
table_name: table, columns: ['Name', 'GP-GS', 'Effic', 'Att-Cmp-Int', 'Avg/G']

### Response:
SELECT MAX Effic FROM table WHERE Avg/G = 91.9