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Hi,
Some new plastic bumper covers and grill pieces could be snapped onto cars. Fairing pieces could be added to side mirrors. Zigzag window trim covers, and hood gaskets, and streamlined wheel covers are easy, too. All these would add 5-7mpg.
Nissan is supposedly going to reduce their cars weight by an average of 15%. I think all cars could be reduced by 20-30% with smarter steel fabrications, smarter use of materials. Narrower and lighter, LRR tires should be used.
On defrost mode, the A/C should only come on automatically at maximum (if at all) and it should always be toggled on/off by the driver.
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