Interesting about that lean burn mode! Probably factory disabled for emissions reasons (raised NOX). The 1st gen Insight handles the emissions question with an additional (read: expensive) catalytic converter for handling NOX. At cruise, the car drops out of lean burn every few minutes to purge the stored NOX and catalyzes it with a richer mixture for a few seconds.
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90% just maintaining that 55MPH
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Definitely aero mods for you, then. As far as getting good MPG, that sounds pretty close to an ideal driving environment. Lots of moderate speed cruising.
And definitely get yourself that resettable MPG gauge. Makes this much more fun than messing with a laptop (unless it lives in the car, permanently mounted!).
As for over-riding the OEM torque converter logic, I'm SURE there are people here who would love to know more about this! We've got one thread here (maybe more) about hacking an auto transmission to electrically take control of the torque converter (
http://ecomodder.com/forum/showthrea...tch-10028.html ), but if it's not hard to do it electronically, that would be another great option.