Week 1 coming to a close

As week number one comes to a close I find myself concerned with 'fueling'.  I haven't run a half-marathon since March 20th, but my 'long' runs have typically been around 12, so I'm not too nervous about adding one mile to this Sunday's run.

What I'm pondering is the use of 'GU Chomps'.  I used to use these things all the time when I first started running more than 8 miles, but now I can comfortably run 13 without them.  As I start to head towards larger numbers (hello 20, you are a scary looking number!), I start wondering when I should start eating these things.

I don't want to eat a serving at 13 miles and start running out of steam at 14 because I haven't gotten them into my system soon enough.  I'm going to have to play with these things to see where they fit in best.  The recommended every 45 minutes seems a bit excessive since (as I said) I've never really needed them to get to 13, but what lies beyond 13?  Will my legs start to wobble without proper fuel, or am I just over thinking the whole thing too much?

I'll start playing with them this week, maybe take a serving around 8 miles into my 13 miler and see how it goes.  So many questions... thank goodness I've got 8 months to try and figure all this stuff out!