How did you use my numbers? You averaged a 10 min taxi over the entire fleet for a year and added more savings for taxi in. You can't use non-averaged #'s as an average. If you are going to do that you have to use 6 mins as that is the average taxi out. Then you said 5:01 on two engines saves $3.8 mil which was your original math, yet that was for a 10 min taxi plus additional taxi in savings.
You're not being consistent.
I did change them. That is why I posted above and questioned your 3.8 mil savings.
Regardless, getting further away from the point, there is a time and place for SE taxi.
Look at going from 250 to 300 on the flight plan, maybe 100-200# savings in a typical flight. 30# of savings from taxiing. 130-230# of fuel? You are going to be running out of gas by not going econ and not SE taxiing? Not saying you should not do it, but let's cut this dramatic crap. People going balls to the wall aren't anywhere near in danger of flaming out the engines because of it.