Table schema:
CREATE TABLE table_name_61 (mpg_us_urban INTEGER, mpg_uk_urban__cold_ VARCHAR, mpg_uk_extra_urban VARCHAR)

Question: What's the mpg-US urban when the mpg-UK urban is 20 and the mpg-UK extra urban is less than 37.2?
SQL: SELECT SUM(mpg_us_urban) FROM table_name_61 WHERE mpg_uk_urban__cold_ = 20 AND mpg_uk_extra_urban < 37.2