I found it really difficult to hear and understand this sentence. I thought it was "Er mog Kaffee." I should've been listening closer to "ear mogT Kaffee" and known it wasn't "air mog Kaffe." Next time! =)
With this sentence you can hear it. But I suppose the person who says the sentence knows how many people they are referring to, and then you hearing the sentence would know they mean plural because they said so. Can you give an example of when you would need to say you and not know if you're referring to more than one person?
I typed you like coffee but it's incorrect. It's supposed to be you're fond of coffee.