Not quite the same, but my mpguino under reports my mileage by a bit. I decided not to recalibrate it, so I'm just nicely surprised each time. It's off by just the right amount, actually: if I put in a bit of effort, I can get a trip (and sometimes tank) average of over 50mpg according to the computer. This translates to about 53mpg at fill-up.
bryan1980 
Threaded Mode
