Question: What's the CO2 g/km of a Fiat running on diesel with the L/100km urban more than 6.3 and an mpg-UK combined of 43.5?
SQL: SELECT COUNT(co_2_g_km) FROM table_name_20 WHERE fuel_type = "diesel" AND manufacturer = "fiat" AND l_100km_urban__cold_ > 6.3 AND mpg_uk_combined = 43.5