We did the Katy Flatland Century. DH predicted we would "thrive" and we did! It started with a rain storm which meant the first 7 miles were at about 10 mph, but then the skys cleared and we were off! I couldn't believe how strong a girl used to hills can ride when it is flat. There were 5 "speedbumps" and nothing else. The only significant climb was up an overpass.

101.16 miles
5 hours 37 minutes
17.7 mph average