My last long run

Today was the last long run in my marathon training plan and I ran 16 miles.  I'm still trying to relive my younger / faster days and I find that I'm hitting the wall after 11 miles.  If I'm going to finish the marathon I'll need to find a group that is going to run 9 minute miles so I can finish in less than 4 hours.  

We are only two weeks away from the Philadelphia Marathon and the weather has changed to chilly with the long range forecast for race day a cold 22 degrees.  That makes today's 40 degrees seem like I was running in the tropics.  I've been training for 7 weeks and I've seen hot / sunny days to cloudy / cold days.  Since I don't think I'll have any support staff at the race I'm a little concerned about what happens after the race.  I'm sure there won't be parking anywhere near the race and if it's cold out I'll have to cross the finish line, grab my medal, a bottle of water and keep running to the car just to keep from freezing.  The last thing I want to do if cool off and catch a cold!