16% is one heck of a correction factor. Mine is set for 6% based on GPS and mile markers/stop watch readings.
I find that the temperature gauge on mine is 'variable'. My dash gauge has markings at 180, 200, a hash mark (which I suspect is supposed to be 225), then a mark at 250. At temperatures of 180 on the dash gauge, VMS reads about 178. At 200 on the dash gauge, the VMS reads about 194. Above 200 on the dash gauge the difference grows tremendously. By 203 on the VMS, the dash gauge is reading what I would interpolate as almost 220. Analog gauges are for the birds when it comes to accuracy.
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