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The problem in comparing a bullet and a car adding weight is aerodynamics. A heavier bullet will be longer, for a given diameter, than a lighter bullet. Adding weight to your car is internal and doesn't make it longer and more aerodynamic. At long range competitions they are shooting very heavy-for-caliber bullets, but it is more to reduce wind drift than anything else.
In town with the stop and go weight will hurt you. On the highway it doesn't make much difference, just a little on the rolling resistance. That is somewhat offset by increasing the momentum and allowing you to coast a little further.
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