One of my cars has a completely full tank of mixed 2 and 3 year old E10 in it. No Stabil or any other additives were added.
1) Car was parked in April 2011 with 1/3 tank of E10 - no additives.
2) Started and drove car for half an hour in Summer/Fall 2012 (gas was on the order of 14-16 months...
