You will be shocked at the cost of the pre-mixed products. I can’t imagine why anyone would buy them. You can get “ratio-rite” products that make mixing easy.
Two strokes will run on an amazing range of mixing ratios and even non-specific petroleum or vegetable-based lubricants. In the old days it wasn’t that unusual to mix ordinary motor oil if a two-stroke lubricant wasn’t available, although you would never think of doing that now.
Each motor has an optimal ratio but even these can be debated. I personally have had motors whose specifications ranged from 20:1 to 100:1. The specs are developed based on operating temperature, jetting, performance requirements, load characteristics and metallurgy (bearing types, mostly). Correct jetting is often much more important than correct mixing ratio. The mixing ratio does affect the jetting, but the change is rather small within reason.
In a pinch, most of these motors can be run on ratios much more lean than specified. In fact, crankcases generally have quite a bit of oil sludge that provides adequate lubrication at low rpm, even with no premix at all!
Just buy a gallon of marine 2T oil and mix it at 50:1 and everything will be fine for the vast majority of motors. Even my air-cooled motors seem to tolerate that OK. I have generally stopped using tailored ratios except when spark plug appearance or spooge acccumulation suggests otherwise.
I've several Stihl tools, including the go-to chainsaw, all of which specify 50:1.
Also have an inherited Jonesred chainsaw and trimmer, both of which are crap, and they specify 40:1.
For all the times I've had to F with that J saw, am gonna try pouring some 50:1 down its throat and free up a gas can !
maniacal LOL