Purchasing Diesel Fuel from First Nations Retailer

".......when my 100 gal tank was about ½ full"

About :H
Was it 1/2 full or was it closer to 2/3 empty.
What do you use for fuel gauge?
When did you have it last calibrated.

200 liters (52.8 gallons)--240 liters (63.4 gallons)
Your method of measurement is probably the less accurate

I put 32 gallons in my 35 gallon tank today......gauge read just under 1/4 prior (7-8 gallons)