CREATE TABLE table_66550 ("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 total L/100km extra urban fueled by diesel, when the mpg-UK combines is more than 19.2, mpg-US is less than 50 and the L/100m combined is less than 5.7?
SELECT COUNT("L/100km Extra-Urban") FROM table_66550 WHERE "mpg-UK Combined" > '19.2' AND "L/100km Combined" < '5.7' AND "Fuel Type" = 'diesel' AND "mpg-US Combined" < '50'
SELECT COUNT("L/100km Extra-Urban") FROM "table_66550" WHERE "Fuel Type" = 'diesel' AND "L/100km Combined" < '5.7' AND "mpg-UK Combined" > '19.2' AND "mpg-US Combined" < '50'