Wow, I really lost track of this thread. My daily commute is 95% highway. Half of it is in a 65 mph zone and half is in a 55 mph zone. I pulse and glide from 65-55 in the 65 zone and 60-50 in the 55 zone. I leave early to go to work (usually arrive around 30 minutes early) to avoid traffic.
I'm highly considering the warm air intake for the Matrix as my wife does not pulse and glide like I do. However, I haven't actually done anything as far as installing it yet. Here is a thread that explains the warm air intake:
http://ecomodder.com/forum/showthread.php?t=529