It's not the calibration of the "side-of-the-road" signs as they match GPS. Mine reads roughly 4.5 mph faster.
So to be safe I just do 10 over the limit on city roads and 15 mph over on the highway.
OK. It's not to be safe. It's just to get to McDonald's before they stop serving breakfast. They'll usually still serve you if you're late, but it's the old stuff and I want fresh preservatives and faux meat.
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