Newest information that I found...it is from Good Houskeeping..It is funny, but I HAVE been doing the walking like I said, but not 4 miles (like I had planned) worth. So tomorrow is my weigh in at work (it has doctor scale more reliable than my old digital) and I will post...the following is a copy/paste from that article that I just mentioned. By the way this walking 4.5-5 miles...
However you break down the steps, there's only one fabulous result: a slimmer, more energetic you. In 60 minutes of walking, you'll burn 300 to 500 additional calories. Keep that up for 10 days and you'll lose a pound. Keep it up for a year and you'll be 35 pounds lighter — without a minute of dieting.