Thanks Robert, Joshua. Yes, I've tried both extremes now in the 2 TTs I've done. Went out like a fool on the first one and blew up, then pootled around on the second and put in a burst at the end. I'm a hill-climber, really, and long distance rider. These TTs were only for a bit of fun, but the damn things niggle at me, given how fast I can go over long distances, and how I haven't gone much faster in a measly little 10 miler. On a relaxed geometry bike, riding on the hoods, I still think I should be doing around 27-1/2 minutes given what I do on, say, 100km rides. I think I'll set out a local 10 mile ride and just practice a bit.