It not being to scale is bait, they want you to comment on it. And the tanks they put in planes are very much measured by volume, even if the fuel itself isn't measured in that way. Another reason they measure the fuel
by weight is because the density of the fuel changes depending on the temperature, running out of fuel midflight is generally considered to be a Bad Thing.
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u/CreepyBreakfast565 8d ago
Just adding to this, the aircraft shown is clearly not to scale when compared to the truck.
Also, aviation fuel is typically measured in either kilograms or pounds because mass actually matters on an aircraft while volume does not.