From what I've researched, the 2011 Subaru Legacy 2.5i was the last model year for the Legacy to have the EJ25 four cylinder engine.  It was replaced with the FB25 for 2012 onwards.  As you all probably know, the EJ25 had been used since 1998-1999, and was notorious for external head leaks.  My 2011 Legacy 2.5i only has 26k miles right now, but does this mean I will encounter head gasket problems as the miles rack up?  I have a 7 year/70k mile warranty, but still..

Unlikely you will have head gasket problems.Subaru improved head gasket design over the last ten years to correct the weakness.

From what I've researched, the 2011 Subaru Legacy 2.5i was the last model year for the Legacy to have the EJ25 four cylinder engine.  It was replaced with the FB25 for 2012 onwards.  As you all probably know, the EJ25 had been used since 1998-1999, and was notorious for external head leaks.  My 2011 Legacy 2.5i only has 26k miles right now, but does this mean I will encounter head gasket problems as the miles rack up?  I have a 7 year/70k mile warranty, but still..

 

Outbacks got an updated MLS headgasket in 2010 so your 2011 has one as well.  Of the EJ25's this would be the best one available from Subaru regarding headgasket issues, so you have a good chance of not having any issues.