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Poor gas mileage in your 97 Geo Tracker, despite it running smoothly, could be caused by several factors. A clogged air filter may restrict airflow, leading to inefficient combustion. Additionally, issues with the fuel injectors or a malfunctioning oxygen sensor can disrupt the air-fuel mixture, affecting fuel efficiency. Lastly, under-inflated tires or a failing catalytic converter could also contribute to increased fuel consumption.

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