For the units, I believe it's either one or the other- imperial or metric. So you'll either have to switch between them for the fill up, or switch for the turn out. There may be a work around that I do not know about, but to my knowledge that's how it works. Maybe keep MPG, and then switch to metric for the fill?
Gallons should go to the tenth at fill up. I am unclear if this is your first fill up, as in starting to correct it, or if this is your very first use. Keep in mind my setup was almost a year and two years ago for these guys, so others will probably chime in with more help.
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