Table schema:
CREATE TABLE table_name_6 (model VARCHAR, mpg_uk_combined VARCHAR, l_100km_urban__cold_ VARCHAR, green_rating VARCHAR, manufacturer VARCHAR)

Question: What model has a g green rating, has chrysler jeep as a manufacturer, has an l/100km urban (cold) less than 18, and has an mpg-uk combined of 27.7?
SQL: SELECT model FROM table_name_6 WHERE green_rating = "g" AND manufacturer = "chrysler jeep" AND l_100km_urban__cold_ < 18 AND mpg_uk_combined = 27.7