In my Keurig K-Cup Reusable Coffee Filter I use a Gevalia coffee scoop, heaping. I measured it to be a little over a Tablespoon. Now that's how I like it, just a little bit weaker than most. Hope that helps you.
It takes about one pound of decaf every month. I fill the cup 3/4 full and add cream and sweetener. However I only use two cups of coffee each work day and none during the weekend. The savings are incredible! The coffee is better tasting and it is simple to use.