[Healeys] Fuel Tank Capacity

[Roger Grace]

My manual gives a capacity of 54.5 litres for the fuel tank.
After draining the tank (via drain plug) and adding 2 measured litres so can drive to gas station, can only add 47.5 litres to the top of filler.
Have done this exercise twice.
What gives ?
Thoughts pse.
rg

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