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I've got a 2008 G35x that displays MPG on the dash, it's a little generous on the mileage (about 5% high), but overall gives a decent representation of how well I'm doing. I have an OBD II splitter plugged in under the dash with a Scangauge II and Ultragauge plugged into it. Scangauge gives me temps, throttle position, etc. (stuff that doesn't get calibrated) and the Ultragauge gives me all the calibrated stuff (MPG, instant MPG, GPH, etc.).
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