What would cause any car to use up fuel/gas than normal
A good tune up is a must, new plugs air and fuel filters. Then O2 sensors are the first thing that comes to mind, then there is ECT sensor, both tell the ECM about air fuel ratios while driving. The best way to check the system using a "live data" scanner, that way you can see what signals each sensor is reading, and if any of those sensors are out of specs then replacement is needed. Of course there are other factors like fuel quality, engine loads, tire pressures, altitude etc.
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