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Save fuel, gain up to 5 MPG and add horsepower with the Innovative Mercury Grand Marquis Performance Chip! Safely gain up to 35 HP and up to 5 MPG in fuel mileage in your Mercury Grand Marquis due to increased engine efficiency - the Innovative Mercury Grand Marquis Performance Chip is the answer to today's high fuel prices and all of us looking to squeeze the hidden power and fuel economy out of the Mercury Grand Marquis!

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