CREATE TABLE table_name_61 (grid INTEGER, driver VARCHAR(255), laps VARCHAR(255), time_retired VARCHAR(255))
What is the average grid that has over 8 laps, a Time/Retired of +2 laps, and peter gethin driving?
    
SQL: SELECT AVG(grid) FROM table_name_61 WHERE laps > 8 AND time_retired = "+2 laps" AND driver = "peter gethin"