We are a couple of old retired duffers, so our usage pattern is overwhelmingly urban and typically no more than 30 miles a day (i.e. boring and pottering), but today we did a freeway run (Orcutt to SBA airport, hwy 101) that was almost exclusively at 67mph, set on the cruise control.
We set off at 191 miles range, but it was only showing 28 when we returned home, for a trip that Google maps has at 62.6 miles each way - so we were off by a long way (66 miles)
Could the guessometer have gotten too "used" to our normal routine, and been fooled by the long freeway run?
Also, in what was basically a "warm fog" at 46 to 59 deg F around 4 a.m., we found it best to have the fan on the lowest setting and air directed at screen and feet (no recirculation) - this combination just kept the screen clear and our heads unchilled so neither heat nor a/c was used.