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_23840623_4 ( epa_rated_combined_fuel_economy VARCHAR, vehicle VARCHAR )

### Question ###
What is the epa rated combined fuel economy for the Nissan Leaf?

### Accurate SQL ###

SELECT epa_rated_combined_fuel_economy FROM table_23840623_4 WHERE vehicle = "Nissan Leaf"