I have been mixing two-stroke with every tank for quite some time.
For optimum pump lubrication, a ratio of ounce/gallon is about ideal.
I notice no difference in EGT or "sluggishness".
I use it year round in all my trucks.
In winter, I keep adding the two-stroke plus white-jug PowerService.
I have a measuring-cup graduated in liquid-ounces.
I saved a bunch of quart-size long-neck MarvelMysteryOil bottles that are ideal for pouring into fuel-tanks without dripping and spilling; I never throw away my bottles, using them over and over.
Any long-neck bottles will work, such as HEET, STP fuel additive, etc.
I guesstimate how much fuel I will need, then I pre-mix the two-stroke (and PowerService if it is winter), topping the bottle off with clean fuel to thin the two-stroke and aid in pouring.
I mix each bottle for twenty-gallons of fuel, in order to have room in the bottle to top it off with fuel.
I keep several pre-mixed/twenty-gallon bottles in the truck for those times I fuel away from home.
I have used both yellow-jug Pennzoil Universal Two-Stroke TC-W3 and Walmart blue-jug SuperTech Outboard TC-W3 and can see no difference in either for my purposes of pump lubrication.
ONLY USE Two-Cycle/Two-Stroke oils rated TC-W3 for mixing with diesel.
The two-stroke mixes readily with diesel and stays mixed, regardless of the ratio.
It also mixes with any of the better anti-gels and conditioners.
Two-stroke oil is used in snow-mobiles, boats, and chainsaws in temperatures of 40-below; it is not going to gel .
I performed some tests in my -20* deep-freeze.
After being in the freezer over-night, an ounce/gallon mixture of two-stroke/diesel was less cloudy/waxy than a mixture of PowerService/diesel.
A mixture of two-stroke and PowerService in diesel was not noticably different than just the two-stroke/diesel.
The pure diesel was almost one solid clump of gel.
Before using the two-stroke, I was using PowerService/MarvelMysteryOil mix; I had two trucks with steady fuel drips from the injection-pump, probably due to ULSD fuel.
Both were leaking bad enough that I was planning on pulling the pumps and re-sealing them.
A couple days after I started using the two-stroke oil, the leaks dried up and haven't leaked any since, saving me the time/trouble of sealing the pumps.