Hello Jart. Welcome to the site!
How long have you had your scangauge? At one point, I had issues with mine as well where it just wouldn't work with a new car. I contacted linear logic and they were able to get me an updated scangauge with a new chip in it that worked. I wonder if this isn't a similar issue.
That being said, I don't really have any issues with my scangauge on the Mirage. It works great and I use it every time I drive.
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View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)