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I've used a vacuum gauge in the distant past. I don't think it helped much, because it didn't really give me the positive feedback I really needed.
With my new Ultragauge I can see my instantaneous consumption and am much more positively influenced to 'tread lightly'!
However, I am in the process of buying a vacuum gauge for my wifes car. I'm hoping it might help her to drive more economically - but only time will tell!!
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