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Years ago Chrysler engineers determined for each 100 lb loss in weight, a 0.1 mpg gain was obtained. This applied to larger cars with higher Cd. Test by adding weight. I would not carve on the unibody or eliminate all forms of bumper for safety sake. Substitute lighter materials and eliminate parts not used. A lighter battery, wheels, and seats would help so long as you don't sacrifice satey or comfort. Big gains are from aero mods and driving techniques.
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