64
Half a gallon
not that much
A US gallon of water is 8.35 pounds. An Imperial gallon of water is 10 pounds.
23
a gallon or so
One quart
1.56 cents per ounce
Zero as you can not make a gallon of gasoline from water.
One gallon of antifreeze mixed with half water
You can use 4 pounds as a rough measure. Pounds is a unit of mass/weight. Gallons is a liquid measure. They do not convert cleanly. The density of the liquid being measured can make a big difference. If the liquid is water, there is 8 pounds to a gallon.
One gallon of water