Because the last two fill ups, the DIS (as you call it) has been within 4% of what I'm actually getting when I do a fill up.
First fill up showed 23.5mpg and I got 22.7mpg.
Second fill up showed 23.8mpg and I got 23mpg.
As it's showing 28mpg... I know that I'm getting close to 27mpg.
MG
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