By my figures you have a 50gl tank. You said it took 32.9gl to fill up from a 1/4 tank, I rounded up to 33gl to fill up so 33 divided 3 is 11, for the 3/4you were down, now if that last 1/4 was truly right at a 1/4 that is 44gl, 6 more gallons and you are at 55.
Next time run down below a 1/4 and see what you get to fill up.
I had a 2016 31L and it was a 55gl tank, made the mistake a time or 2 running it down past a 1/4.
Now my new Omni XG32 has 2 tanks for 70gl, I try not to let it get to a 1/4.
__________________
|