So i just bought a 2003 1.8 litre, and i love it, but mine seems to be terrible on gas? I'm not rat-bagging it or anything, but i burn like a quarter tank just driving to and from work. I have no idea what the problem is, figured someone here probably does.....

And also, for some reason my trunk likes to pop open while I'm driving from time to time, could it be my key, my trunk, or the computer?