AM commute is 7.3 miles with about 400 ft of climbing. I alternate between my CX commuter and my CF road bike. I usually average about 16mph on the CX bike, and 18-19 on my road bike. My AM route is all on roads, but can be done without putting my foot down, under ideal circumstances, but usually I have to clip out 2-3 times, so it's pretty quick. My PM commute is mostly the reverse of the AM route, but takes a bit longer due to left turns and heavier traffic, so my average is usually 15-16mph regardless of bike.