Just to elaborate a bit on what the various estimates are....
The main figure shown on the dash is rated (or ideal, if you changed the settings) miles. That's basically, if you drive the same way as the official testing, that's how far you can go. In practice, you'll achieve that range going around 65-70MPH on level ground. It will overestimate your remaining range in many real situations, since you're often going faster or have to deal with terrain.
The projected range on the energy graph is a dumb projection of the past into the future. It looks at your efficiency for the last 5/15/30 miles and says, if this goes on, you'll make it this far. If you're at the peak of a long climb, it will vastly underestimate your remaining range, because it'll assume you're going to keep on climbing forever. Likewise if you're at the bottom of a long descent, it will vastly overestimate your remaining range.
The trip graph is the only one of the bunch which actually tries to look at your route and predict the future based on it. It looks at typical speeds and elevation changes and based on that it projects how much charge you'll have left on arrival. This tends to make it the most realistic of the bunch, but it doesn't account for things like wind, so it's not always correct. Usually it's the one to watch, but re-check it every so often to see if the projection starts to change. If it's starting to drop a lot, then something is making you less efficient than it thinks you should be. Depending on your situation, you may want to slow down, stop early, or just keep an eye on it.
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