I love Car and Drivers 75 mph 200 mile out and back fuel economy runs. Unfortunately, both the 2017 Niro HEV and the 2018 Niro PHEV tests were done during the winter, which skews the results (42 mpg and 40 mpg respectively). It would be nice if they could have included other test data like temperature, and wind conditions. Even though they do a round trip which will negate head/tail winds to some extent, cross winds also damage fuel economy. For all I know, they adjust for temperature, but otherwise, I would hope summer fuel economy for the same test will be 10 percent better.
2018 Kia LX HEV Metal Stream with Advanced Tech