Gas Tank Sloshing?

I notice the sloshing every once and a while, but seriously the beer in my hand when I'm driving sloshes more.
 
I would think FWD and AWD have the same tank. Don't they?
If I turned the music down and have 4/5 full tank, I can easily hear the sloshing.
This is most prominent when you have driven about 50 miles (2-3 gallons off) after a full tank.
 
If it's any consolation my Mazda3 sloshes all the time...ever since I bought it. I just ignore it.
 
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