With your PHEV, do you check the odometer to make sure that you are getting your exact 26 miles each time? Heck, the HEV that I have, why does it count down the KM remaining when I am driving around in EV mode as the battery is close to full charge and the engine it turned off. The distance remaining is just a software trick as I don't know how it knows how to calibrate itself. all I can do is take the difference between the odomiter readings each fill up and look how much gas went into the tank and do the math. Sometimes the number is way off.
2018 Niro EX - Ocean Blue
GTA - Canada.