Too Early To Taper

I'd like to start my taper right now. June, July and August add up to nearly 800 miles on these tired legs. I'm four weeks out and my knees and assorted muscles need some rest. So, one more week of regular training, one more 20-miler, then a 25% cut down, including more rest days, will begin.
I don't like this point--4 weeks out. The accumulated training has me feeling beat-up, yet it's really too early to taper. But I will start to make my easy days a little easier so that my last long run next Saturday will feel better than last week's. When I lived in Minneapolis, this was a great time to race and see the fruits of training. But...there are no races here, so I'll plug away this week, then start counting down the days.