[PapaBear3625]

It had to do with politics, namely Canada's decision to be more progressive about fuel measurement than its uncouth big brother to the south.

Yes, I understand about fuel loading errors (in that case caused by confusing gallons with liters). My question was: "Why don't airplanes have fuel gauges, like we have in our cars, which would let the pilot know how much fuel they have at the moment? And maybe alert them, like my car does, when there's only half an hour's worth of fuel left?"

Is there a technical reason why you can't put a fuel gauge on a plane's fuel tank?

[Swordmaker]

Yes, I understand about fuel loading errors (in that case caused by confusing gallons with liters). My question was: "Why don't airplanes have fuel gauges, like we have in our cars, which would let the pilot know how much fuel they have at the moment? And maybe alert them, like my car does, when there's only half an hour's worth of fuel left?"

Is there a technical reason why you can't put a fuel gauge on a plane's fuel tank?

They do. . . but there are multiple fuel tanks on an aircraft of that size. . . wing tanks, center wing tanks, etc. They don't measure by gallons of fuel either, as I understand it. It's by weight. Fuel expands and a gallon measurement can change with temperature. Weight, not so much.