Average above means the. The US engineer will see that for type A the average is 2.5 while for type B it is just 2.0, concluding that type A is more efficient than type B as it can cover a larger distance with a gallon of gas. The French will see that for type A the average is...
Avgas weighs 6 pounds per gallon, so multiply the gallons by 6. (If your airplane burns Jet-A, you’ll have a table that will tell you how much it weighs at various temperatures—it’s usually a little over 7 pounds per gallon.) Remember to include everything in the airplane that is...