Shibumi:
Mental toughness is by far one of the most important aspects of athletic competetion.
If you are not tough, you don't stand a chance.
We could always use more toughness. You seem to be making good progress, and thinking about the mind can only improve your results.
It helps a lot if you have a mentally tough personality to start with, but by far the most important factor is burning desire to achieve goals.
You will recall many months ago lots of people thought I was crazy when I said you could get extra watts in a race if your head was in the right place.
They said it couldn't be done.
Well, you can clearly see based on your last TT, this is absolutely true. The mind is the only thing controlling skeletal muscle. When the mind is not properly focused, maximum performance will not occur.
Whether or not you could have maintained the last 4-mile pace over the entire course in unknown, but it's obvious you could have worked harder from the start.
First, let's get back to mental toughness. One of the best ways to see how tough you are is to ride a fixed gear bike in training.
There is nothing fun at all about riding a fixed gear, especially going downhill when the natural tendency is to coast.
Riding a fixed gear bike is a total commitment. A 42x17 thru 42x14 is plenty for most riders.
If you have been doing TT/power work on the flats on a fixed gear and you hit a nice decent, you will hate every second of downhill pedalling.
You are forced to do constant work. Climbing is very hard since you don't have access to easier gears. Fixed gears force you to use a wide variation of cadences, which most riders don't like to do as well.
Many, many riders would drop out of the sport if fixed gear bikes were the only type available.
Fixed gears will make you very tough mentally if you can tolerate riding one.
I would encourage all riders who time trial to accept the fixed-gear challenge. A fixed gear and a turbo form a potent combination for greatly improved fitness and mental toughness.
Back to your racing. You should finish every time trial completely spent, without the energy to turn the cranks for another 30 seconds at that pace. If you could have maintained your pace for another 10 minutes, you didn't do enough work.
The best TT'ers go by feel. It takes time to figure this out, but is really the only way to maximize your human potential. Use technology to review you performance once home.
If you are training properly, all thresholds and performance-testing data are constantly changing, making the data from last month possibly null and void this month.
The ONLY thing that does not change is your feel. As Greg LeMond once said: "It doesn't get easier, you just go faster" meaning riding at your limits for a 10/25 will always feel the same, only your times will change.
Focus on developing proper feel for just how hard you can push to cross the line completely spent.
For your next TT, try one of the following:
1) Increasing your TT cadence 3-5 rpm in the same gear.
2) Use a 55-56 tooth chainring with the same gear and normal TT cadence.
3) Go for it and use the next harder gear at normal cadence.
So what if you crack using more gear??? At least you tried. However, you may find you are really capable of a lot more than you think and last the entire distance. You won't know until you try.
Good luck!!!