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I've added the Cube to our Vehicle Drag Coefficient Wiki. Cd = 0.35, CdA = 9.48ft².
Most of your energy is spent overcoming aerodynamic drag, so your biggest gains would come from reducing your cruising speed or improving your drag coefficient.
After a few stealthy mods, your ability to lower Cd without drastically altering the character of the Cube will hit a wall. Those stealthy mods include wheel covers on the inside of the wheel, a grille block behind the grille, and underbelly work if Nissan overlooked any. Beyond that, maybe you could work in some quirky looking rear wheel skirts. Unfortunately, cubes (not Cubes) have fundamentally bad aerodynamics, especially at the rear, that can not be cured without taking much of the cubicness out of the Cube.
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