Philly Distance Run - the preview

I am excited to go up to Phila PA and run a workout on the PDR course. I volunteered to lead a road trip from here (Del.) so that we can get familiar with course... and generally for something new & different to do. Here's the club announcement.

This is open to anyone - so feel free to join us if you're in the area. Here's a link to the course map. I love that the elevation profile shows range from low of 24' and high of 55'. Did I mention that i don't run hills very well?

Although my enthusiasm is being cut by the fact that I'm not sure how I'm going to pull together a PR attempt. Based on my recent hard effort work outs I have lost all my speed. I traded in my speed for marathon long runs... and now I can't seem to get the speed back. Here's a summary of last Sunday's long run, second week in a row that I did this workout. This was intended as a Cooker (but ended up more of a steady simmer?)?

July 12 - first 6 miles averaged 8:30 over varied home neighborhood loop. 75 degress & 75% humidity.
mile 7 - 8:05 includes one hill
mile 8 - 7:59 big hill
mile 9 - 7:46 why am I not going faster, and when will this end?
mile 10 -7:40 is this measured correctly? Feel like I'm working much harder than 7:40.

tacked on one extra as a cool down. I got noticably slower compared to last week. Maybe the trail run the day before took something out of me? Maybe a bit more heat & humidity too. This workout felt good, but the times are just not what i was hoping for.

I'm going online to search for some half marathon training schedule/plan. At least the preview is no Hills at PDR - hoping for no Heat or Humidity.