Range anxiety is such a "charged" issue (sorry!), it dawned on me that TM is shooting itself in the foot with the dash display.
Case in point - showing projected range in big numbers is the wrong focus.
When you go up a hill, the projected range will change wildly, but what does this really tell you? Effectively, it says "if you keep going up this hill until empty, this is how far you can go". But this is a bogus projection, because you won't endlessly go up this hill.
People see the rapid decline in the big numerals , and freak out. Yet this is not at all reflective of what is likely to happen. It confuses a remote possibility (continually high demand), with currently extant reality, (actual juice in the pack), and it exaggerates worry about nothing.
This is like your credit card telling you that if you spend at this instantaneous rate (measured say, at the moment of a large purchase), if you do this endlessly, you will owe a lot. Gibberish.
The better focus is your fuel gauge, (state of charge which decreases slowly by comparison, and is not frightening).
The fuel gauge already figures prominently in the display, but the big numbers for projected range compete for focus, and are alarming.
You focus on the fast changing digits, but they're not the story, the fuel gauge is. Yet your cerebral cortex is built to focus on faster changing phenomena, so you ignore the very stable fuel gauge, and instead give all you attention to that alarmingly rapid decline in digits. Imagine if you saw your gas gauge suddenly spike up or down. You'd think you sprung a leak, and panic. This is not the right UI paradigm.
The other point is that projected range is much less useful than a pair of other numbers for range: Low and High
There are so many variables that affect mileage, the safer thing to do is to provide an envelope for the range you can expect based on how you drive.
So here's a straw man:
Below the fuel gauge, at each end are the low and hi numbers, in a more subtle font.
What does this tell you?
You have 70% charge, and If you drive hard, you can likely go at least 90 miles. With a really light foot, you can go as far as 150 miles.
This inherently gives you useful advice. If you know your destination is closer to High or to Low, you drive accordingly.
Inherently though, you'd never witness on fast changing digits (like the altimeter of a plane in a nose dive), and never have to overcome your subconscious fear with a conscious calculus that "you should ignore these digits as a temporary artifact".
The current approach provokes worry about nothing.
What do you think?
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