I still think it's a bit rubbish that you can't easily measure what's in the tank. That is assuming the dipsticks on the Cessnas are accurate....!
With unreliable/unusable fuel guages, dodgy dipsticks, I'll have to say it again, once you get used to the aircraft, and know it's fuel burn it's not rocket science to work out how long you have when you know what the previous fuel uplift was, tabs/full. And yes there will be a record of fuel uplift won't there? It isnt that hard to get a good estimate from just looking in the tank anyway. Do you intend to fly to the last drop? Of course not, So don't get too hung up on it.