My car uses up fuel faster than usual.
The car using more fuel can be due to a problem with an engine sensor, such as the mass air flow sensor giving incorrect air flow readings to the computer, or you may just have a clogged air filter. If the Check Engine Light is on, then the light would need diagnosed for the problem you are having. I recommend having a mechanic, like one from YourMechanic, run a full diagnosis of your engine and computer to check for any maintenance needed, and/or sensor issues.
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