1/2 gallon of gas won't fill a 362 up that many times. I usually fill up my saw with gas and bar oil whenever I turn the saw off, so I don't run the tank empty that often. Therefore, I measure fuel usage by starting will a full gallon of mix and then seeing how much I have left when I finish the job.
If I use near a full gallon of fuel, that is because I had to do some noodling. I cut all of my logs to a weight that I can safely lift into my trailer. If the log is over 16" diameter, it probably needs to be noodled in half. If it is over 24" diameter, I will probably noodle it into quarters. Basically, I don't want to lift anything more than approximately 100lbs over the side of my trailer which is almost 4ft high. My dad has had recurring back problems and is about to have his 5th back surgery because he injured his back when he was young lifting something too heavy. I don't want to injure my back trying to make a few bucks selling firewood.
One of the reasons that I bought a pro saw is because I knew that I was going to have to load all of my logs by hand, and I wanted a saw that I wouldn't wear out by noodling a bunch of logs at one time. I once felled and cut up a post oak that was over 40" diameter at the base. The biggest rounds were almost 4ft diameter and my usual 20" long, so they had to be cut into 10 pieces just so that I could safely load them into the trailer by myself. I guess if you have a tractor or split the wood where you cut the tree, then you don't have to worry about this. But that doesn't work for me because I don't have a tractor or access to a big enough splitter, and I don't want to be in the woods that long away from my wife and 3 small children. So yeah, I usually use 1/2 to 1 gallon of fuel when I cut a cord of firewood.