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So, after driving pretty slow on the highway and taking some flatter back roads (my wife commented she had never seen me so happy to see the speed limit drop to 25 before), we made it home with 2 miles of range left.
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It was a bit nerve wracking, but at least we made it and the car got a good charge overnight. ...
FWIW, someone actually hit 0 -- and got the necessary 4-5 miles at ~ 20 - 40 mph to get home. While I wouldn't count on that in everyday planning, apparently there is a "reserve tank" in the sub-zero range!