Over two years of driving PRIME, I have filled the tank total of 48 times so far. I have kept accurate record of gallons filled, cost, miles driven, mpg displayed in between fill-ups. As you know with EV drive included in the distance, the displayed or calculated mpg has no meaning, unless you did all of the drive on HV. One thing I did not pay much attention to and did not keep record is the DTE (distance to empty) displayed immediately after the fill-up. In 48 times fill-ups, I only kept 6 records of DTE. What is your DTE showing immediately after the fill up? I know some of you fill up so infrequently or never fill up the tank. But if and when you do, please report here. What we know is that for PRIME's DTE, battery charge and EV range is not included into the estimation. If you drive all on EV mode, and never on HV, then DTE distance will not change. If you fill a tank when your battery is empty, and then you charge the battery full, you will not gain ~30 miles of EV range onto the DTE. It is strictly based on HV mode drive only. The initial estimate of the DTE after fill-up must be based on the mpg for the previous tank. Since it is the estimation of the distance to the low fuel light, which comes on when you have ~2 gal of fuel still left in the tank. The amount of gas used for the estimation of DTE must be ~9.3 gal. Would that mean, if I am getting 574 miles on DTE after fill-up, was my previous tank's strictly HV only mileage, 61.7mpg (574/9.3)?