Instruct: 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?
Output: SELECT COUNT CO 2 g/km FROM table WHERE Fuel Type = diesel AND Manufacturer = fiat AND L/100km Urban (Cold) > 6.3 AND mpg-UK Combined = 43.5