I had a couple of false starts, but finally got zipping along. Once it was done, I weighed it and it was 45grams, with a small butterfly of the yarn left, weighing less than what my scale will weigh. The length is good, can be wrapped once around the neck, or worn folded in half and the ends pulled through. It did need a good steaming after it's wash!
Orange--Bernat Super Value, "Carrot", Camo--Bernat Camouflage "Renegade". Singer 155 (9mm). Cast on 37-0-38, every other needle, T3, knit 4 rows. Change row counter to 000 and fill some of the empty needles, T4, knit 4 rows. Fill more empties, T6, knit two rows. T 8, knit body to RC53 rows (I went a little more with the orange). Switch to Camo and knit to about RC 96 and start taking needles out of work (doubling the stitch with it's neighbour). Gradually decrease tension, so that by RC 106 you're down to T3 and about 1/2 the needles left in work. I like to reduce it down even more over the next 4 rows--I find the hole closes easier. Although the labels gave the same gauge, the camo knit up slightly looser. These numbers are for the kids hat, for an adult, I just made it longer (I tried casting on 40-0-40 and it was quite large).
Yarn In: 10 566gr + 197gr + 142gr = 10 905gr
Yarn Out: 45gr (scarf) + 240 gr (two hats) = 285gr + 8900gr = 9185gr
Balance: 1720gr more In than Out
Costs: $177.48 + $15.23 = $192.71/99 days = $1.95/day
I think that's a reasonable expense for a hobby that gives joy to me and my family, and even provides much needed items for other more needy folk!