eesh that's impressive. Usually after 2 miles I'm like "ok, that's enough jogging for me." Unless I'm playing basketball, then I can usually find energy.
Today I did .5 miles @ 6mph, .2 miles @ 8mph, followed by a couple minutes of cool down jogging to warm up for my workout. My cardio is actually in a much better state than I thought. (i.e., I was a little winded, but I wasn't panting for breath, bent over, about to vomit and fall to the floor.)