So know bogging down on the uphill and no cars being slowed down behind you?I finally did my trip over two mountain passes ( 2 there and 2 back!) and I got a good indication of the cars performance.
It's no corvette but it went over both passes at 60 mph (100 kmh here in Canada). At the end of the trip I could confidently say that the fuel mileage was almost a wash .... that is, it used more fuel going up, but I had a lot of free miles on the downhill sides. I even saw that the 'km remaining' estimate actually increases the longer you drive in pure EV. I saw 100% charge 4 different times and it really stretches out the free miles.
I'm even happier that I bought the Niro.