CREATE TABLE table_66552 ("Manufacturer" TEXT, "Transmission" TEXT, "Engine Capacity" FLOAT, "Fuel Type" TEXT, "L/100km Urban  ( Cold ) " FLOAT, "L/100km Extra-Urban" FLOAT, "L/100km Combined" FLOAT, "mpg-UK Urban  ( Cold ) " FLOAT, "mpg-UK Extra-Urban" FLOAT, "mpg-UK Combined" FLOAT, "mpg-US Urban" FLOAT, "mpg-US Extra-Urban" FLOAT, "mpg-US Combined" FLOAT, "CO 2 g/km" FLOAT, "Green Rating" TEXT)

What's the mpg-US urban when the mpg-UK urban is 20 and the mpg-UK extra urban is less than 37.2?
SELECT SUM("mpg-US Urban") FROM table_66552 WHERE "mpg-UK Urban (Cold)" = '20' AND "mpg-UK Extra-Urban" < '37.2'
SELECT SUM("mpg-US Urban") FROM "table_66552" WHERE "mpg-UK Extra-Urban" < '37.2' AND "mpg-UK Urban (Cold)" = '20'