I don't even give a second thought about the internal volume of the Leshiy's air tank. All I know is that I get a sh%t load of fills from my Great White tank and the second gauge helps to know if I'm running low on air. I'd be more concerned about calculating total fills if I was shooting a big bore.
Good for you but its not about you - its about Liontracks asking how many fill from a given tank volume and in that sense your sh%t load is not very useful - but 51.35 compared to 41 cm3 makes a difference