Still another object of this invention is to provide a visual display of an internal combustion engines intake manifold vacuum to the driver of the automobile so that he will be aware of {HEAD ~ the effect} of his driving habits on {TAIL ~ fuel economy} 
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Still another object of this invention is to provide a visual display of an internal combustion engines intake manifold vacuum to the driver of the automobile so that he will be aware of { HEAD ~ the effect } of his driving habits on { TAIL ~ fuel economy }
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