Wind!
It was very windy tonight and I had to face it all the way home. I learned a great lesson, though. I simply got into the drops and forgot about my speed. Rather, I simply focused on keeping a comfortable heart rate and enjoying the ride. Total EXTRA time over 13 miles....a grand total of 6 extra minutes. Turns out wind is just not that big of deal if you drop your speed and enjoy the ride (extreme conditions excepted, of course).