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Downsizing from 15" to 14" wheels may cause issues with fitment with brakes. While Insight wheels are the cream of the crop for being lightweight and aero, the cost to buy them, and new tires, and potentially spacers to make them fit, may not make it financially worthwhile.
But that all depends on your goals for modifying.....more power? better fuel economy? make the car cheaper to operate without spending much? aesthetic limitations?
Increasing tire pressure and adjusting driving style will improve fuel economy more than all the modifications in the world.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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