I'm suspecting the mileage range left is not calculated by how much fuel you have left, but by either your mpg from recent driving or your recent driving habit. I've monitored it during a long highway drive starting from full tank. After a few miles on the highway, I actually saw the range went up compared to the moment I just pulled onto the highway from "local" roads. So if I actually had less gas than what I'd had half hour ago, how was it possible that the range increased?
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