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Mo Free, We have to assume that you are only partially filling the gas tank, which must be down near empty before you added the fuel. Without doing a mileage reading at the time you added the fuel, and then again at the time you next fill up, and then doing the math on distance travelled and the fuel used, its impossible to give you any kind of an answer. I can say that with all of the various cars I'ved owned in 46 years, that many of them had fuel gauges that never read accurately across the entire gauge face. Some after a total fillup would never have a gauge movement off full for 80 miles or more. Others would drop from full quickly and then took forever to get from a quarter full to empty. And then some seemed to be fairly consistent throughout the entire gauge face. Until you actually do a mileage check, its a stab in the dark to know whether your car is using too much fuel. Then again, a lot of that is based on how you drive the car, tire pressures, the terrain you drive on, stop and go versus highway driving, etc.