Newbie Kegging question

This is probably a stupid question but here goes anyways....

Do you have to fill a keg before carbonating and serving it? Does it change the process/time to carbonate at all? I want to put 2.5 - 3 Gallons of beer into a 5 Gallon corny.

I'm asking because I made a batch of stout a few weeks back and separated it into 2 - 3 Gallon carboys and used 2 different types of yeast to see what the difference in taste is. Now that I am the new proud owner of a kegerator I am itching to try some beer from it.

just make sure to really purge the extra head space. you will use more CO2. other than that, i doesnt matter. it may even carbonate quicker than normal.

blackwaterbrewer said:

just make sure to really purge the extra head space. you will use more CO2. other than that, i doesnt matter. it may even carbonate quicker than normal.

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QFT (quoted for truth)