RE: Let's try again DL-50
Everyone has to make their own decision about fumes. I have no problems with that, as I keep the chokes closed, and plug the exhaust stack tubes when in the workshop. Of course, I drain the tanks, also. Many don't. Many have a lot of fumes. Lots of variables.
Personally - I have not run Coleman fuel, but have read posts from many with lots more experience.
Their story - basically - it ain't worth it.
Figure out how to deal with ventilation and run the recommended gas and oil ratios.