So despite my Dad being the Lord when it comes to cars, I'm more like Leonardo Di Caprio's character from What's Eating Gilbert Grape. I understand enough to keep the wheels turning and enough to keep from having to take it into the service station for every little thing, but otherwise I'm a vehicular moron. So, here's my question; why is it that on an average week, I travel a grand total of 183 miles from home to work and back (I work four days in a normal seven day week) and my tank is completely empty, but yesterday I drove to South London and back, a 227 mile round trip, with the return trip being heavy two massive suitcases and a wife, and I use not even half a tank? I drive an '02 Honda Civic hatchback; while home, I rarely go anywhere that requires driving; where I live, everything is within walking distance. The only time I use the car to go anywhere other than work (lately; now that the wife is back, that will change) is to go grocery shopping, but I have five grocery stores within a one to five mile radius of my home, so it's never more than a two to ten miles round trip for grocery shopping. Now, the speed limits are more or less within ten miles per hour of each other for both trips; my trip to work, I average a speed of 60, maybe 70 or more in short bursts on the highway (I'm on back roads most of the time). The trip to London has me going 70 or more pretty much the whole trip as it's almost all highway. The trip to work has more twists and turns that require me to brake and slow more; the trip to London are a series of three or four straight shots for fifteen to up to thirty miles apiece. I'm just trying to figure that out. I was sure I was gonna be running on empty by the time it was time for the return trip, but no, I was actually still on a FULL tank when I got to London. Does that make sense, or do I have a faulty as Hell gauge?