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_66547 ( "Manufacturer" text, "Transmission" text, "Engine Capacity" real, "Fuel Type" text, "L/100km Urban (Cold)" real, "L/100km Extra-Urban" real, "L/100km Combined" real, "mpg-UK Urban (Cold)" real, "mpg-UK Extra-Urban" real, "mpg-UK Combined" real, "mpg-US Urban" real, "mpg-US Extra-Urban" real, "mpg-US Combined" real, "CO 2 g/km" real, "Green Rating" text )

### Question ###
What's the average L/km combines when the L/100km Urban is 13.9, the mpg-UK combined is more than 28.5 and the mpg-UK extra urban is less than 38.7?

### Accurate SQL ###

SELECT AVG("L/100km Combined") FROM table_66547 WHERE "L/100km Urban (Cold)" = '13.9' AND "mpg-UK Combined" > '28.5' AND "mpg-UK Extra-Urban" < '38.7'