I don't know what model you have, but ours lets you select from 3 cup sizes. Have you been using the large cup button? If you have a really large mug even the large button won't fill it all the way. I have to do a large cup and then a small cup to fill my mug. I use the same Kcup for both. FYI Amazon.com sells a wonderful little thingie that lets you fill it with your own coffee. It is much better then the one that comes with the machine. Also, every Friday at the Amazon Friday Sale they have fabulous prices on the K cups.
I had to call Keurig once with a cleaning question and they were very helpful. Have you discussed your problem with their customer service department.
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