If it crapped out your saw, I sure wouldn't put it in my mower, they are sensitive to old fuel also. I put my unused gas in my truck and haven't had any issues. 1 oz of oil in 20 gallons of gas is not going to affect any sensors anymore than an engine that "burns" a quart of oil between oil changes. 1/400 (20 mpg x 20 gallons) =.0025 where as 1 quart ( 32 oz ) burned over a 4000 mile period is .008 so you would be about 1/4 the ratio of a slight oil burner.
Some folks overthink things.
BTW: no matter how careful you are (unless you shoot a flaming arrow at your brush pile from 50 yards away) gasoline used to start a fire is unsafe.
If you are afraid to put it in your truck, just pour it out on concrete and let it evaporate making sure there are no sparking materials nearby. While not good for the atmosphere, it is much better for you than chancing it on making a fire. Use your tractor diesel mixed with used motor oil for starting fires.