Two ounces per quart equals, um, 2 x 4 = 8 oz per gallon. I believe the previous thread suggested a maximum of 4 oz. per gallon, based on info from Bob Emmett, via Dave Royer.
It should be made clear that while this is all well & good for that model with not enough tank capacity, it's really not a good way to save money. In general, your engine will be happier if your setup burns a lot of the appropriately formulated glowfuel, i.e., without Coleman fuel. More fuel burn means more open NV, more flow, less restriction for any little bits of junk in your fuel to hangup and make for a lean run. Perhaps a reason not to use low viscosity oil? Put in a bigger tank if you can.
Steve