CREATE TABLE table_66547 ("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 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?
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'
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'