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To fix bad gas mileage in a 1990 Geo Tracker, start by checking and replacing the air filter if it's dirty, as a clogged filter can restrict airflow and reduce efficiency. Ensure the fuel system is clean by using a fuel injector cleaner and consider replacing the fuel filter if it's old. Additionally, check the tire pressure, as under-inflated tires can lead to increased rolling resistance. Finally, inspect the ignition system, including spark plugs and wires, for proper function, as misfires can negatively impact fuel economy.

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1mo ago

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