Some EVs get as much as 20 percent less range than the window sticker figure in our highway test, although others, typically from German automakers, have exceeded their EPA range figures. We then round down the range to the nearest 10-mile increment. We've been generally surprised at just how linear the decline in the battery's charge is, and that there aren't big drop-offs along the way to zero. We compile those data points into two trend lines that we use to extrapolate the last few percent of battery that we didn't use. We record the entire run with a VBox LapTimer or Driftbox and also record the battery state of charge and the vehicle's predicted range every five miles. We start with a full charge and run at a GPS-verified 75 mph for as long as possible, turning around at the halfway point to end back in our office parking lot. We run our range tests primarily on the highways surrounding our Ann Arbor, Michigan, office, and we typically run them during the middle of the day, or on nights or weekends, when the traffic is lightest.
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