You will lose the fat by doing cardio. Doing 1000 crunches will 'tone' your midsection, but how would it burn fat? I'm a huge fan of doing HIIT. That's something that you might want to look into. Because you're running that long for several days a week, you are most likely burning muscle. Supplements might help you get to your goal about 5% quicker. The other 20% is training followed by 75% diet (don't ask where I got those numbers from ).

Post your diet.