Forget to fill up gas

Yesterday I get up in the morning at 06:00 AM. Because this day I enter to class at 07:00 AM. I don't want come late to campus. After I take eat breakfast in a minutes, I go to campus by driving my car. But how annoyed me, because my gas is empty. I forgot to fill up the gas after back from campus yesterday. So, I go to campus by bus and I not late come to campus.