I'm still new at this biking thing. I have a trek 4300 MTB that I got to ride around town to do errands and have some fun on. I've had a string of dehabilitating injuries so I am unable to run. I've been biking out on country roads. There are some smaller rolling hills but nothing too major. On my longer rides I average between 15 - 15.5 MPH for 45 miles. I don't know how that compares to a road bike. I think I'm doing well since I've increased about 2 MPH since I started. I would like to know if this is a good pace compared to a road bike.