Regarding range, see:
http://www.bombardier.com/files/en/s...01-IGK7-HR.JPG
CS300 ER is promised 5463 km nominal range. How does A318 compare?
Regarding interior, see:
http://www.bombardier.com/files/en/s...01-IGK7-HR.jpg
145 seats in single class. Hm... let us replace 6 rows of seats at 30 inch pitch with 5 rows at 36 inches pitch - what will we get?