All you need to do is use just one granule of coffee per cup and you fully can go past 400 cups per container.

Maybe they did improve the process. We need some coffee junkies to test this out with the old and new containers.

This could be nothing but company BS.

At 51 ounces you would need 0.1275 ounce scoops for 400 cups
At 43.5 ounces you would need 0.10875 ounce scoops for 400 cups.

You have to be extra accurate to get that 400 cups out of it.