PaleMalenesian, Thanks for the report of the FuelMax tires. I have had my eyes on those come this fall. That 5% alone is about the difference between your 22 and our 21 mpg.
One could also try upper grille block, from the inside. Extend the undertray. Ensure the valves are adjusted correctly and plugs are in good shape. Keep the inside from getting filled like an overstuffed purse to keep the weight down.
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Good design is simple. Getting there isn't.
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