I am easily getting over 40 MPG in city driving (hand calculated), yet when taking long Texas highway road trips when I must push 75 mph I only get 34.5 on the average. I have been trying to find a -magic- highway speed to get to my appointments on time and not waste efficiency. I don't seem to have found the sweet spot on this. I am in Texas Hill country primarily making continuous ups and downs and running lots of A/C lately. I have tried 68 MPH which seems to push me up to around 36.5 to 37 MPG's. I will also 'pedal shift' the car into e-mode on downhills, but I can get sloppy on this on 6 hour trips. Anyone got a compromise speed they've found to get somewhere relatively fast. I cannot drive 55 MPH, I know this is where this vehicle shines, some places I drive out here the speed limit is 80... The semi-trucks are doing all of that. Thanks