Dang, that was only 4 days for a gallon of ice cream.... Nicely done!
But denser, creamier ice cream will tend to be higher quality.
If you were to melt a gallon of that crap they sell at the grocery store, itd probably be 1/3 of its size in the bucket. But, premium would be more like... 3/4s or more when melted.
Gelato is pretty much... awesome.