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PaleMelanesian, we have a nice stretch of fairly flat interstate, here in the southern tier, which stretches for many miles. I have a milage gauge built into the car. I can see my milage move up and down instantaneous as I accellerate. I verified accuracy with filling tank at start of trip and filling up tank at finish of trip to double check mpg. When I first installed the magnet before a trip I couldn't believe the difference so I immediatly filled the tank, manually figured the mpg and it was whithin a few tenths of a gallon difference.
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