So if I have an Advantage Bar, do I give it the actual carb count or the net carb count in Fitday?

I used the custom foods feature and entered in the net carbs (2 grams). Fitday won't calculate the net carbs for you since there isn't a a place to specify sugar alcohols.

What had me concerned was that the value I got at the hidden carbs link was close to 7. Is it true that the carbs aren't used by some people, but are by others? I would be one of those who use every bit of potential calorie available, trust me.

I try to find every hidden carb and count them. In the U.S., food manufacturers can put '0' carbs on the nutrition label if there is less than 1 carb. Even up to .09 carbs, they can list zero.