Heat+hills+humidity=hard!!

  Couldn't help but get out late this morning. Just an easy run on the schedule but I will tell you it turned out  to be hard!! The heat index is nearly 100 so with hills and humidity it was pretty tough. I remembered back in "the day" when I'd run 10 milers of hills in mid-day August! Oh the wonders of youth!!
  So i slogged this one out, putting 48 minutes on the roads, having negative thoughts in regards to the race Saturday?! Gee, if I can barely survive this how will I give a good effort Saturday? I am in a dreadful deficit of miles! Yes, maybe I've put 8 weeks in of gradual building and have finally reached 20 miles per/wk w/o injury or pain, but I need to be realistic....can I even run 3.1 as a FCR? If so I really will need to adjust pace  to a realistic goal...I was hoping 10K pace which is 8's...but after today?.....don't know? Plus I don't want to be embarrassed? On track this week to stay in base camp II, only need about 120 more minutes on roads! Peace!