Mine is pretty much spot on for "AVG"
You have to watch "LPH" as that is instantaneous as reported at the sample times from the ECU so can be a bit hit and miss but gives a good idea of trends.
My fuel useage sky rockets at about 105 KPH and I get significantly better figures around town and up to 100KPH than at hi speed cruise BUT I have a lot of Mods so no comparo to factory... I've seen it as high as 17.5 but never 20's
The one small weakness of the Scanguages is with Chipped engines if the Chip changes the fuel rail pressures after the ECU and is open loop BUT the Scangauge will still be pretty damn close.
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