Originally Posted by pdqaltair
I did a study for Practical Sailor Magazine a few years ago. NONE of the additives had ANY material effect on e-10 separation. They may do other things, but they DO NOT prevent separation.
Yes, I suspect you were getting occasional e-10 separation. The best cure is to keep the tank full and the vent closed when possible.
May I respectfully suggest that you look at butyl cellosolve.