with 4 passengers and some hilly driving, my first tankful was a 45.5 indicated and 46.6 calculated. For the first half tank that I was driving, I was at about 51-53 indicated then we literally went uphill from there (at 65-75 mph ).

For our second tank, we had an indicated 46.9 with a good bit of slow (offroad at times) uphill driving...