Some want the GOM to use a week's driving, others want a day.
Before the Mar 2012 firmware it used about 5 minutes,
now it is reported to use less "history".
I would like it to use about 5 to 30 seconds of history, so it would
mean: "Keep driving like you are NOW (last "few" seconds) and
you should get about N miles".
And, the suggestion of a Reset option is also good.
All this could be on a "Preferences" screen on the Nav unit,
even with different preference settings for each RFID.
For Ingineer, the estimated Range would have 4 decimal points
(like 45.3462 miles), indicating the Range to the nearest 6 inches.
(I DO support all the good work that Ingineer is doing.)