If running 3 miles a day or trying a high rep/less weight workout isn't working out to shed fat, maybe you should give this a go...
http://www.ast-ss.com/articles/article.asp?AID=97
It makes sense. All high reps and less weight does is eat your muscles away. The same with jogging 3 or 4 miles a day. Trust me, being in the infantry in the Marine Corps I had no choice but to do this for four years. My muscle mass suffered. Here's a good example:
Stand a sprinter next to a distance runner. The runner is alot skinnier while the sprinter is yolked. Short powerful bursts of speed will speed up metabolism while not eating away your muscles. I'm not saying that distance jogging doesn't work, just that it isn't optimal to keep your mass.