12 hour TT - how much to eat?

I am still mulling over how much to eat on the 12 hour TT this weekend.

Interesting couple of articles here

http://www.saris.com/athletes/PermaLink,guid,6db7d592-53a6-4a3e-839b-93703a780ba8.aspx

and here

http://www.saris.com/CalorieCalculator.aspx


Based on latter I have done some sums:

Assuming I weigh 73kg on the day of the ride and that I am pretty fit I will have

73 * 25 cals of onboard glycogen so around 1900 cals.

Assuming I do my plan 220W per hour then I will be using something like

220 * 12 * 3600/1000 = 9500kj

I reckon I am pretty high efficency so cals = 9500 * 1.05 = 10000

The ride will be a bit harder than easy so say 60% of cals come from carb = 6000

So less 1900 from onboard so means I will need to eat around 4100 cals during the ride, about 340 cals per hour.

So that's my plan...interesting to see how it turns out