IM Training - Extra Week

I wouldn't add to the taper. First IM I did I had 3 week taper and felt I lost fitness...never again.

Extra rest or repeat a week are good options depending on how you feel.

I'd listen to my body and adapt the plan based on that. I'd most likely stretch the plan out and repeat workouts to do that and/ or take an extra rest days to fill that extra week.

You have 21 days of training to do in 28 days. If you took extra rest day or two as needed that fills 23 days. Take 5 days and repeat them or do a version of them....then you have stretched 21 into 28.

It is a pre-existing knee injury due to running.  Because of this, I have been slow to build my running in training and am still not completing 100% of the long runs.  I would like to get to 100%, but that will be a judgement call based on how they feel the next few weeks.  Actually, it is more of a nagging injury (combination of runners knee and a bakers cyst) and I should be able to push through it even if it gets worse.  Unfortunately, it hurts during all 3 activities, so I wont get off easy if I drop one activity from training for a week. 

I have heard mixed reviews on long tapers. I guess it is just a personal preference and I have not noticed much of a difference in previous training periods.  I already have a 3 week taper, with a recovery week prior to that.  That is basically 4 weeks of tapering and I don't know if I should extend that. 

I like that idea.  It is kind of the compromise between the two.  Great for someone who is having a hard time deciding.