One nice thing about my Prius is that it has an average MPG gauge built in, and a 10 gallon tank. This means calculating the range is so easy, a caveman can do it. Simply take the average MPG as displayed, and tack a zero on. That is close to how many miles I can expect to get on that tank of fuel. At 50 MPG, I can go 500 miles on a tank. (The rated capacity is 10.4, so that leaves a small buffer). The fuel light always turns on when I have over 100 miles of range left. I'm very comfortable going another 60 miles while the fuel light is illuminated. (I've run completely out twice, but I have EV range as a backup).
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