I personally have never seen a gallon can of Cox fuel. Just think how long a Babe Bee would run nonstop on a gallon of fuel!
I have 4 gallon cans of Cox Power fuel.................. though not actual Cox gallon cans.
A friend of mine, who is in the toy business, bought a large quantity of surplus Cox ready-to-fly products and sold them all on Ebay. In order to get around shipping problems, he emptied all of the fuel cans which came with the product and not having a use for the fuel and knowing my love for small engines, gave me 4 gallon cans of the stuff.
If the fuel didn't work so well, we could hook up a Babe Bee and see how long it would run. I'm going to guesstimate about 13 hours.
My McCoy .19 also really runs well on the stuff, of course, I add some extra caster.
Orv.