I am not even sure I would dare give a distance estimate.
If I look at some mobile devices I have access to:
Dell laptop: estimates time remaining in hours and minutes; in my experience, that estimate isn't reliable.
iPod Touch: the most concrete it gets is a warning "20% battery charge remaining". Is likely to show it multiple times. The display only shows a tiny bar.
iPad (and, I think, the iPhone): goes a bit further; can show a numerical battery percentage.
For both iOS devices, the Settings app also shows a "Time since last charge" section with "Usage" and "Standby" times. It does not dare give a time remaining.
Mobile phone: 5-bar battery full indicator.
Back to the electric car: especially given the short range for a full charge, I understand owners will want a distance remaining estimate, but I would say: if you can't give a reliable one, don't. 'Percentage charge remaining' plus a 'at similar speed and weather, you typically would have stretched this for x miles' indicator, IMO, would be better. And that is even more than a gasoline powered car will give you.
If I look at some mobile devices I have access to:
Dell laptop: estimates time remaining in hours and minutes; in my experience, that estimate isn't reliable.
iPod Touch: the most concrete it gets is a warning "20% battery charge remaining". Is likely to show it multiple times. The display only shows a tiny bar.
iPad (and, I think, the iPhone): goes a bit further; can show a numerical battery percentage.
For both iOS devices, the Settings app also shows a "Time since last charge" section with "Usage" and "Standby" times. It does not dare give a time remaining.
Mobile phone: 5-bar battery full indicator.
Back to the electric car: especially given the short range for a full charge, I understand owners will want a distance remaining estimate, but I would say: if you can't give a reliable one, don't. 'Percentage charge remaining' plus a 'at similar speed and weather, you typically would have stretched this for x miles' indicator, IMO, would be better. And that is even more than a gasoline powered car will give you.