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I got an ultragauge for my HX and have been very happy with it. I still plan on installing an MPGuino at some point to get accurate instant MPG, but I can at least use it to see when I'm in lean burn and get good feedback when I'm not in lean burn or DFCO.
Make sure everything is tuned up and read up on hypermiling techniques. I got over 50mpg on my last tank, and that's without any mods. Judging by my ultragauge 40mpg without mods should not be too hard if you drive correctly.
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