My route is 20.5 miles give or take, so 41 round trip. From home to work the first 7 or so miles are residential road, minimal traffic (On the way home those roads are busier). By mile 8 I am crossing over the Mississippi river, on top of a dam. the next 7 miles is on a MUP that winds through woods and prairie. Typically I see deer, wild turkeys and assorted other little critters. The last 5 or so miles are on busier roads that also have a MUP running along side them. I stick to the MUP but still need to be careful at crossings. Going home I do the exact reverse.
It's a pretty flat course and I think that my house and my office are pretty much the same elevation, yet for some reason I average 1.5 - 2.00 MPH faster (Moving time) on the way home. Motivation, maybe. Who knows.