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Well, a lighter weight car is no new science and many manufacturers have talked about it, but seldom happens. The new X series was suppose to be lighter, but turns out not really. One major problem is that while the chassis was lightened, but more safety features or luxury equipments were added, so often the new cars ended up not any lighter.
Hopefully the new tougher emission laws and higher milage requirements will push the car makers towards making not only more efficient (engine) cars, but also lighter cars.
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