Alright. My 2013 civic. I'm taking it in on Saturday once again. I filled up my gas tank yesterday and im now down to half. All of the driving I did with the full tank was from the gas station to my house, then to work. Car says I'm getting 33.6 mpg which is absolutely impossible. I see nothing under the car. Can you have a leak internally? I figure I have to be pouring gas out somewhere.