How much milk is needed to make a gallon of ice cream?

A traditional Italian artisan yellow base mix contains 1030g milk (3.5% fat), 300g sugar and 12 egg yolks (approx 200g). Total weight 1530g. When mixed, whipped and frozen the air added (called overrun) increases the volume by a factor of 1.5. So, 1.53Litres makes 2.3 litres of ice cream. Divide original ingredients weight by 1.5 to find amounts required to make 1 litre. ie 687 g milk, 200g sugar and 8 eggs (approx 120g). Use conversion factor of litres to US gallons (3.75 I believe) to find amounts you need.