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ok, I guess I am too old school, just accidentally found forum, but before these "newfangled gadgets" that are expensive, guys put in a vacuum gauge, keep eye on it, drive to keep highest vacuum possible. use same pump every time le it auto shut off, don't round gas up, & calculate savings & mpg on paper at each fill up. I fill out paper 99% of my fill ups, & been doing this for well over 30 years.
but yes a simple vacuum gauge will help driving habits.
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