Partialling fueling 148 gallon tanks in later models

[JeffAxel]

my '77 P model had only one filler port per side, but 3 interconnected fuel tanks in each wing. They functioned like one big tank though. I suppose you you could make a dipstick and fuel it in increments on level ground to determine how much fuel is on board. Even LOP, you only get 4:30 to 4:45 before you should be landing with an hours reserve. I burned 24gph LOP in the mid to high teens and saw 180-185KTAS.