The Little Miami trail is one of my favorites. I did Milford to Young's Dairy which I think is roughly 74 miles (or at least, that's what my cyclometer said after I got a little lost looking for Young's... oops) and it was great. However, someone did mention that going north, as the trail runs next to the river, there is an ever so slight incline. I always wondered why it felt like I had to work harder - now I know! I was probably ill-prepared too - double oops!