Still another object of {TAIL ~ 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 the effect of {HEAD ~ his driving habits} on fuel economy 
Still another object of { TAIL ~ 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 the effect of { HEAD ~ his driving habits } on fuel economy
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