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One of the car manufacturers won't do anything under warranty unless you are consuming more than 1 quart/1000 miles. That is a lot more oil going through your cat than mixing in a little mix gas.

Your engine would do fine on straight 2 stroke. I would worry about the catalytic convertor though. 1 gallon of 2 stroke to 19 straight gas would give you a ratio of 1000 to 1. Good to go. Most car companies consider a fairly sizeable consumption of motor oil to be acceptable. I think it is...