First of all, I think doing something like that once is romantic and thoughtful. Doing it our of the blue say, three to four times a year is endearing. Any more than that, and you're just getting into a hell of an unfortunate pattern, and I would watch out for the implications on your relationship.
I have friends like this. Their boyfriends leave work and buy them lunch, then bring it over so they can have the full hour. While it's a nice gesture, the girl never really reciprocates because she feels it's her due as a woman to be catered to.
When someone goes out of their way for you, it's nice and it makes you feel good, but you should be able to bring this up to her in a pretty frank way. Let her know the drive is exhausting and irritating and although you love her, you think there's a way to satisfy her fix that doesn't involve so much of your time. I mean, WTF. Don't you work? This year for Christmas buy her a whole basketful of Starbucks coffee, oversized insulated mugs and the like and she can make it at home. Every so often, send over flowers with a fresh cup and a note telling her how much you love her. For crying out loud, if you can't even bring up the coffee issue, life together will be hell. Communication > All.