There are a lot of variables in the energy use. The major ones are the speed and elevation changes. My EV range can easily be over 40 miles at the highway speeds when I lose 400' of altitude over this distance. I drove a low speed limit flat road on the Florida Gulf coast in the hybrid mode and achieved 45MPG. Driving on the highways I can see the rated 33MPG if I keep my speed in check. The economy starts going down noticeably above 50MPH. This is a square function, and the economy drops faster than the speed raises. Driving 75-80 I get maybe 27MPG.