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Clois,
That is a correct formula. However, gasoline weighs from 5.8 to 6.5 lbs per gallon. (Specific Gravity of .69 to .78)
Therefore, (.5 lbs/hr x 450 hp)/ 6.5 = 34.61 GPH.
However, it is normal procedure to have a supply source that can provide 150% of the HP requirement.
(If this is really needed, I do not know. You will have to ask someone who has experience greater than mine.)
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