Two Fridays ago I had six miles to run at half marathon pace (~7:40), ending up running a 7:32 average, and could not believe how easy it felt.
Sunday I ran a 1:16 5K PR on about 90% effort, basically no 5K-specific training, and zero taper.
Today, only two days post-5K PR, I ran eight miles at a 7:29 average pace with warm weather, rolling hills, and a stiff headwind half the way. It wasn't quite as easy as the six miles a week & a half ago, but it was extremely manageable, especially considering that I went into it unsure I'd even be able to keep a 7:40 pace the whole time (and totally fine with it). My splits were 7:48, 7:39, 7:37, 7:34, 7:32, 7:24, 7:12, 7:14. Yes, the last couple of miles were downhill and really too fast even so, but I was getting a little impatient & the pace felt good & not at all like I was pushing too hard, so I went with it.
I don't know whether I'll be able to run a sub-1:40 half at Windsor Green (not least of all because I'll have spent the previous evening at a wedding...), but I'm feeling pretty good about taking a more aggressive tactic this time around & seeing where it gets me. :)