michael wrote:As far as judging whether you will reach your destination, I have found the cup of energy display to be very useful. It shows you how many Wh per mile you will need to achieve to make it
Also useful is to enter your destination in the navigation system -- and always
answer "yes" to "will you charge the battery?" there, even if you won't. Answering yes turns the "status" display into a "surplus" display (and affects the cup display too).
In this mode, perhaps more useful than the cup display, is to simply keep a positive surplus (which indicates the range you'll have remaining after reaching your destination). A positive surplus means you'll make it, negative means you won't. If the surplus starts to get low, or goes negative, don't panic! -- simply slow down just a bit
(esp. easy when using cruise control) and wait for the surplus to increase. Or, if you're feeling adventurous, and see that you have surplus to spare (and perhaps will be charging at your destination), why not speed up a bit, or enjoy some A/C.
For longer trips, I find it easier to simply track the surplus, rather that watch every movement of the energy meter in or out of the cup. The cup is kinda like a "micro" indicator, and can be highly variable and "of the moment". The surplus is a "macro" indicator, and is more stable and predictable. Watching the surplus works especially well for freeway trips on fairly flat terrain. I've found it's estimation to be very accurate in that scenario and trust it to get me to my destination, even when running with a low single-digit surplus.