[Pedantic mode] Technically, it is incorrect to multipy volume by SG to determine weight. In reality however, the difference is so small for a/c-sized fuel volumes that it makes no practical difference. (quite a difference for VLCC's though
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Assuming 1 USG = 6lb, then the density@15C of the fuel is 0.7201 and the SG@60F is 0.7203
[/Pedantic mode]