I've fueled up my car 3 times now, but I'm only getting an Average MPG rating, while I've seen others get per-fuel-up MPGs. Do I have to fuel up a certain number of times before I see this statistic?
All of your fuel-ups so far have been marked as partial. When you enter a partial fuel-up, you don't get an individual MPG value for that particular fuel-up or the next one. Fuelly uses a method of calculation that relies on finding the difference from full each time you fuel-up. If Fuelly doesn't ever get a full tank to work with, you won't get a running MPG value. Here's more info about filling all the way up.
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