On my recent trip to Colorado and back I was able to develop a range metric for the Niro EV. Traveling at 75 mph I achieved about 2.5 miles/percent of battery capacity driving in ECO mode and, driving in ECO+ mode, I achieved 3.39 miles/percent of battery capacity. So by direct coloration that gives the Niro EV a range of 250 miles in ECO mode driving at 75 mph and 340 miles in ECO+ mode driving at 60 mph.
I extrapolated these numbers using the Nissan Leaf range chart. Here are the numbers I came up with:
ECO mode full battery range;
85 mph - 189 miles (1.89 miles/percent)
80 mph - 219 miles (2.19 miles/percent)
75 mph - 250 miles (2.50 miles/percent)
70 mph - 272 miles (2.72 miles/percent)
65 mph - 295 miles (2.95 miles/percent)
60 mph - 326 miles (3.26 miles/percent)
ECO+ mode full battery range;
60 mph - 339 miles (3.39 miles/percent)
55 mph - 370 miles (3.70 miles/percent)
50 mph - 402 miles (4.02 miles/percent)
45 mph - 434 miles (4.34 miles/percent)
40 mph - 470 miles (4.70 miles/percent)
My Niro EV EX Premium had less that 5,000 miles on it when I developed this metric and the ambient temperature was around 80 degrees F.
Driving at 40 mph in a current generation EV may sound pretty ludicrous but my experience driving a 1st generation EV cross country taught me the importance knowing my range at 40 mph. I would always plan to have at least 10% battery remaining at the end of my travel legs just in case I have to find an alternative charging location. I will of course redevelop this metric annually so I can account for battery degradation.