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Couldn't hurt but test first to see if its safe/effective for the car. Do you have a way to monitor instant MPG with the Sentra? That might get you your goal (or at least closer to it). If you drive mostly city, focus on weight and tires. If the highway, aero should be a priority (though all areas should be addressed).
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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