user: ### NOW ANSWER:
Question: Name the highest Long that has an Avg/G smaller than 8.4, and an GP-GS of 4–0?
Columns: ['Name', 'GP-GS', 'Gain', 'Loss', 'Long', 'Avg/G']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['Asbury, Chris', '9–6', 3.0, 0.0, 3.0, 0.3]
SQL:

assistant: SELECT MAX("Long") FROM "Table" WHERE "Avg/G" < 8.4 AND "GP-GS" = '4–0';