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My brother in law had an old style Garmin that did jump about, and it did indeed increase the indicated travel distance and speed.
My old Quest aligned the calculated position with the road in its map so it was pretty accurate, as long as the map corresponded with reality.
My current TomTom does that too. It seems to be dead accurate compared with the road distance indicators, switching digits behind the point in the same rhytm as the road markers.
The odometer in my Insight underreads slightly (compared to GPS and road markers), but as the tires wear that will no doubt get even.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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