Is this junk miles?

I need your opinion.<br><br>
I just ran 5K this morning - with w/u and some additional miles afterwards before quickly heading to another commitment was 8 miles. My (slightly adjusted) schedule calls for 15mile long run today. (I am in taper for a marathon - 2 weeks to go). I was thinking to run another 7 miles to make it 15miles total today. Would this be 'junk miles' - just running to make the # - without a clear purpupose?<br><br>
Just to give you a little more complete picture, a tune-up race was suggested Sat (8-10K) then a long run of 15miles Sun today. I couldn't find any race yesterday so I ran a 5k today instead. I had a short interval workout last Wed. and will have another one (1600x3) this Wed. By running just 8 miles today instead of 15miles, my weekly volume is about 40% down from the previous week, which is way more than a typical taper suggested by many experts (usually 20-25% down for the taper week #1). Other than a slight tightness in my hip (which is very normal), I don't have any physical/potential injury concnern.<br><br>
Maybe this is TMI.... but I just don't want to de-train myself. I think I did that heading to Boston last year.<br><br>
Thanks for your quick help. Yes, I need your suggestion soon <img alt="smile.gif" src="http://files.kickrunners.com/smilies/smile.gif">