Wisconsin is not flat!
This is the speed/elevation chart from one of my favorite recent bike rides. I rode out of town and did four laps back and forth over Observatory Road which features a pretty steep little hill with about 200ft of climbing on the back side.
I use the Endomondo app on Android to track my rides, but something was wonky with the GPS recording because the return trip is about 30ft higher elevation on the chart event though I took the exact same route. You can also clearly see that my ride home was quite a bit slower than my ride out. 🙂