Air Crete recipe

We have the Little Dragon machine, but we are confused. As we understand the recipe:
“A 94 lb bag of cement & 6.5 gal of water produces about 40 gal (before foam) or about 5.5 cubic feet or .15 cubic meters of AirCrete at a density of 19 lb per cubic foot.Add 2 cup of soap to 5 gal of water for foam and mix to make 50 gals of Air Crete”
Our question is how many cubic feet does the 50 gals produce?

Google has an easy to use Gallons to Cubic Feet conversion tool:
https://tinyurl.com/ly72n7250 US Liquid Gallons = 6.68 Cubic Feet