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What I do is add half of a quart per 20 gallons and that seems to help the engine run much better!
I run 1/2 oz per Gallon....Fairly easy to figure out with a graduated measuring device (as I'm also adding PS at rate of 1oz per 3 gallons)
Also keeps the math simple for 20 gallons I add 10oz (20/2=10)...or just figure the number your looking for is half of the gallons of fuel you put in your tank.
1/2 oz per gallon would be 128:1 ratio, and you really only need 200:1 ratio to bring regular ULSD fuel to a good lubricity rating, beyond IP manufacturers recommendations.
200:1 would be 1/3 oz per gallon, or 1 quart per 48 gallons, 1/2 quart for 24 gallons.
Wouldnt it be 256:1 ratio for 1/2 oz per gallon( 128oz per gallon x.5)?
Yes, mine were off by a factor of 2, I forgot the /2 in the first calculation.
200:1 ratio would be 1/2 quart to 25 gallons, which is the recommended amount of 2 stroke. Or as you point out 0.64 oz per gallon of fuel.
power service is not a good lubricity additive. If using both every fillup then .5oz of 2-stroke and the recommended concentration of PS should be OK, if the two mix and lubricity adds up, but safer to just add the recommended amount of oil.
If using ND SAE30 would use twice as much as 2-stroke oil.
I'm a dump and go guy. Fill up..dump what I feel like into the tank and go. Sometimes if I forget to buy 2-stroke, I go many tanks with no oil. Oh well.