We use the engine quite a bit, as our normal trips exceed EV range. Our ICE milage is normally indicated as mid to low 30's, best has been high 30's, by the car. I am wondering if this might be off slightly as when I fill up the most I have ever gotten in the tank was equal to what showed as used, but most of the fillups are .1 to .4 gallons less then shown as used. I am the only one to fill the car as my wife has no problem with the plug but won't touch the gas. Has anyone had the chance to check this calibration?