To properly answer your question, I think we'll need to know how long you've been doing the increased mileage, and what your mileage was before that.
Generally, though, I'd tell you no worries. I only skip a run if I'm so sore and stiff that my gait is significantly changed even after a warmup. It's pretty normal, at least to my experience, to feel sluggish on a daily basis, but, in my opinion, fresh legs are overrated. They're for race day, not daily training.
I'll give you my experience. After a summer of slacking off at around 40-50 miles per week, I upped my mileage to 100-120 (which I had trained at before). This was difficult and I wasn't doing well in tempo workouts, or on the track, though I was doing the workouts to do them anyway. I only got 7 weeks of this quality training in before the race, many of the miles at 7:30-8:00/mile pace. I only got a 3 day taper because I had planned on doing it as a training run and changed my mind at the last minute. Well, I ended up running around 2:44, which isn't great but is better than my training predicted.
So, I'd advise you to tough it out, keep going, and wait till race day after a good taper to feel ready.