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_72 (laps INTEGER, grid VARCHAR, time_retired VARCHAR, driver VARCHAR)

### Question ###
What is the lap total for george eaton, with a grid under 17 retiring due to gearbox?

### Accurate SQL ###

SELECT SUM(laps) FROM table_name_72 WHERE time_retired = "gearbox" AND driver = "george eaton" AND grid < 17