Pudge has got it spot on!
Where did you get the idea that you need to carb load for a 10k?
Eating loads and loads of unneccesary carbs will just weigh you down making you slower.
I suppose it boils down to how much you want to gamble.
My local running shop gives discounts to local club members so you may be able to do a bit of a deal with a "proper" shop and get somewhere nearer to the web price.
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Millsy1977
