Some Good News about Treadmills

I was reading my Jeff Galloway book today, and he says that "More and more runners are using treadmills for at least 50% of their short runs - particularly those who have small children. It is a fact that treadmills tend to tell you that you have gone further or faster than you really have (but usually not more than 10%). But if you run on a treadmill for the number of minutes assigned, at the effort level you are used to (no huffing and puffing), you will get close enough to the training effect you wish. To ensure that you have run enough miles, feel free to add 10% to your assigned mileage."