I can't answer your question but wanted to jump on board since I just had a similar issue. I have a VX and an mpguino and i used the initial settings for VX from one of the tables. It seemed to be completely accurate. The first fill up I did after the calibration took almost exactly the same gallons as the gauge said that I had used and the distance was exact. On the next tank I just filled what the gauge said I had used and if I remember correctly the pump clicked off as well. This last fill up however, I was able to get almost a full gallon more into the tank than the gauge indicated. I was at a different station and on a very slight grade both front to back and side to side. Now I have to question the gauge accuracy. Would that slight grade allow a full extra gallon? Do I have a fuel leak somewhere? I guess if I can get back to a level station and have a higher reading next fill, that will answer my questions.
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