What is the usable fuel weight when 40 gallons are on board?

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Multiple Choice

What is the usable fuel weight when 40 gallons are on board?

Explanation:
Fuel weight comes from volume times the weight per gallon. For aviation gasoline, a common usable density is about 6 pounds per gallon. So 40 gallons on board equates to 40 × 6 = 240 pounds of usable fuel. If a different density were specified or if some fuel were unusable, you’d adjust accordingly, but with 6 lb/gal the usable fuel weight is 240 lb.

Fuel weight comes from volume times the weight per gallon. For aviation gasoline, a common usable density is about 6 pounds per gallon. So 40 gallons on board equates to 40 × 6 = 240 pounds of usable fuel. If a different density were specified or if some fuel were unusable, you’d adjust accordingly, but with 6 lb/gal the usable fuel weight is 240 lb.

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