I understand the low rpms/"wide-open-throttle" scenario, and it seemed to work fine in my old car (2002 Nissan Sentra) but I know the '06+ Civics have throttle-by-wire. (This creates some smoothness issues, but that's another topic.
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I think I read that the ECU opens the buttefly all the way in low load conditions and pushes some of the air sucked in back out (reducing the volume of air compressed to about the equivalent of a 1.5 liter vs 1.8 liter) and at the same time using some recirculated exhaust gases too.
I haven't consistently tried the fullt throttle/low rpm technique, but that may (I emphasize MAY) not work in this vehicle.
However - I have refueled here in high altitude Wyoming, and low and behold, ~36 mpg! OK, not great, but considering we didn't drive economically at all, I am quite happy about that.
The engine must (MUST) be above 2000 rpm to have any torque whatsoever, preferably above 2500-3000 rpm. Passing on the highways here is truly a minute long endeavor!
So maybe we should have CO2/nitrogen injection instead of nitrous oxide. Any ideas on what gas to let into the intake that would reduce the O2 in the engine that would stay stable?