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Don't trust the gas gauge, fill up and divide the miles driven by gallons used.

Also, if you really have that bad of gas mileage, how's the car running? Notice any oil in coolant, or vice versa? Blown head gasket would cause really bad mileage but has symptoms you should be able to spot easy.. I say this because head gasket issues are somewhat common on these cars
I'd agree with not trusting your gas gauge. After driving my car sometimes the gas gauge will lower then come back up a couple of minutes later. I know a lot of others who have had this problem as well.
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