Just one more example of how wind resistance after 80kph chews through power. *Equally* true for petrol cars, too, of course. Also worth noting it's very unusual in NZ to be able to drive at higher speed for more than a handful of minutes. I drove from Auckland to Opotiki yesterday in my LEAF and there was always a camper or big truck or slow Nana who keep the speed much closer to 80-90kph on the open road.....if not less in places with hills....plus you go through a town every 10-15 minutes and the speed drops to 50kph-70kph.
Ever tried sitting close behind a big truck?