Using bathroom at Starbucks without buying something?

I travel long distances by car for business and pleasure. I prefer Starbucks bathrooms as they are single bathrooms and often cleaner than others. I purchase something from a Starbucks at least 3 times a week. But there are times when on the road that I will use a Starbucks bathroom without buying anything from... show more I travel long distances by car for business and pleasure. I prefer Starbucks bathrooms as they are single bathrooms and often cleaner than others. I purchase something from a Starbucks at least 3 times a week. But there are times when on the road that I will use a Starbucks bathroom without buying anything from that store. It feels awkward. Not sure how the staff sees it when someone walks in just to use the bathroom. Just wondering what is proper ethics regarding this issue.
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