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_45 (grid INTEGER, time VARCHAR, bike VARCHAR, laps VARCHAR)

### Question ###
What is the average Grid for the honda cbr1000rr, with 18 laps and a time of +1:12.884?

### Accurate SQL ###

SELECT AVG(grid) FROM table_name_45 WHERE bike = "honda cbr1000rr" AND laps = 18 AND time = "+1:12.884"