Some of the places they may be saving weigh may also cause other side effects such as more noise in the cabin from thinner gauge steel, thinner windows, less sound absorbing foam under the carpet.
IF, things like what I listed above are what they changed then they may not want to change it across the entire line. If they did next thing there would be adverts form competiros aobut not buying "noisy" American cars.
Everything is a compromise and a change that would make one area better (like mpg) usualy causes something else to get worse (like road noise, tire grip, creature comforts, internal room, looks, cost).
Though I do wish for more XFE or ECO versions of current cars and if they are going to put out cars that us 1%ers would be buying then I would like for them to push the envelope a bit more then they have in the past. Making a large car a hybrid and then giving it a rating of one mpg better is not going to fix anything.
Though I am hopeful of some cars to come.
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Lifetime mpg
2012 mpg
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