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ok if the goal is to save fuel , then your driving habits and vehicle you choose to preform the majority of your driving duties is the biggest piece of the puzzle, if you drive 4000+ pound large displacement car truck suv and want to feel the acceleration you will burn more fuel..... if you place the imaginary egg under the gas pedal (and brake pedal for that matter) you would likely have better mpg's vs a boat tail . then try changing to a fairly small or mid sized 4 cyl with a turbo /diesel , and keep in mind driving with the mass of your vehicle and what it takes to accelerate that mass. then existing technology (or older tech) can be very good on fuel , without constructing large difficult and costly body modifications (though dont stop modding just pick your battles)
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