Let me add my 2 cents here.
1. I've see only 1 face-lifted one in all my life. I guess it should be very difficult to find.
2 & 3. I came across 3 DE5FSs in AL during last 12 months. All were in white as fookie said.
4. Again, most Demios in SL are basic ones as fookie said. I've found a 2007 DE3FS with CVT, HID, factory alloys and multi-function steering about a year ago (which I bought ). Rare one to find though.
Demio is bumpier compared to other cars in the category. It's not bad as long as you stick to the original shocks at least to the front. Using KYBs to the front was worst thing I've done to the car. So, my advice is to use originals at least to the front.
I owned a Maruti 800 and Corolla AE100 previously. Those are the only cars I have experience with. Demio is a better car by a country mile. Two of my friends who own a Toyota IST 2004 and a Honda Civic EK3 1998 drove my car. They loved the Demio over theirs as far as the handling is concerned.
Colonial Motors and Mazna Motors are taking a good care of Mazdas. Nothing to worry in that department.
Finally the fuel figures. It returns me about 9km/l in Colombo. I drive in the heaviest of traffics with heavy throttle to drop my wife to the office in time . I guess the figures are not bad considering that. I got 19.55 km/l @ 90km/h on the Southern high way. It has always given me 16+ km/l in outstation regardless of how I drive (I keep records with "My Cars" mobile app. So I have all figures with me. ).