Never really used a Vac gauge, but with an Ultragauge for instant fuel economy I went from a consistant 38 up to a consistent 42mpg on a 99 escort. I was already fairly good at the hypermiling thing from my previous experience with my civic and an MPGuino.
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Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways.
One mile of road will take you one mile, one mile of runway can take you around the world.
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