All MPG instrumentation is inaccurate and always will be because of how they work.
You might be able to trim it via OBDII but probably worth getting an SG or UG or whatever the current fave instrument is - I always liked having average and instant together - to run alongside especially if you mod anything (grill blocks etc.) later.
I'm pondering a UG for the Passat but thats just a geeky thing.
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[I]So long and thanks for all the fish.[/I]
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