Camp gas usually comes in a gallon can. Your question indicates you are "thru-hiking" and a gallon is way more than you'd want to carry, your car being no where near.
Am I right?
If yes, you can:
Carry more fuel bottels.
Ask the seller if you can buy "just enough".
Purchase an all fuel stove (my Optimus Nova is one) and fill your fuel bottles at a gas station.
Leave the can for others to fill from.
Most small sellers will work with you. If you are buying from a big store like a Walmart, you leave the can with customer service. A multi-fuel stove makes this really easy. ;-)