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_90 (mpg_us_combined INTEGER, transmission VARCHAR, manufacturer VARCHAR, green_rating VARCHAR, mpg_uk_combined VARCHAR)

### Question ###
What is the lowest MPG-US combined for a green rating of E, mpg in the UK- combined of under 42.2, manufacturer of Volkswagen, and an M6 transmission?

### Accurate SQL ###

SELECT MIN(mpg_us_combined) FROM table_name_90 WHERE green_rating = "e" AND mpg_uk_combined < 42.2 AND manufacturer = "volkswagen" AND transmission = "m6"