The standard pot per the Jet Boil site is .8 liter:
http://shop.jetboil.com/index.php/sol-cooking-ti.html
A bit over 3 cups or 3.38 cups to be precise.
You must be using that New Math or something.
You can fudge numbers sure..but these are direct from the manufacturer.
I know you enginerds love your gear, but this is getting ridiculous. You like your toy..cool. And god knows it is fast and efficient. But raw numbers suggest it may not be the most efficient for real world use with multiple people unless you add a bigger pot and spend more money.
I really can't see otherwise after doing some basic math with standard backpacking meals. But I am not the smartest dude admittedly.
I think I've done beating the horse.
.