My observation is when I hit the bottom of the window, then lift the seat, the level is right at about 50% of tank height. The tanks are kinda bulbous at the ends and contoured along the bottom so I wouldn't equate that exactly with fill percent, but there is plenty of fuel left visually.Sounds good Kremeneon. Someone pointed out that the tank goes a little further down than the window shows. I believe I am gettting about the same as yours when all things are considered.
Have you noticed any issues with tire lines, or cut lines? I lowered the deck a tad, and noticed some pretty deep "tracks".
Looks to me like you have some soft grass that takes a set easily, or soft loam. I don't get tire marks that 'strong'. You might also check your deck for left/right level.