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My NOX is the sixth car I've owned that will tell you what mileage you are getting. Three cars always had a dead on number compared to hand calculating, three always gave you a number that was one mpg higher than what I would hand calculate. The NOX falls into the category of giving you the higher than actual number. What is the experience out there?
 

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My '10 always read about 2 higher than actual, while my '18 is very close to actual.
 

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My '18 Terrain is within two tenths higher than the hand calculated MPG. It seems to be linear with the amount of fuel purchased. A fill of a near empty tank will be towards the two tenths. A fill with a half empty tank will be about one tenth.
 
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