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Very interesting thread.
Not exactly in direct response, but a bit about my experiences with RPM and the like:
I have a Del Sol with a B18A1 (92-93 cams, peak torque at 5200RPM, same as B1) mated to a 92-95 B16A3 (Y21) transmission. At ~35MPH, shifting from 4th to 5th (2800RPM -> 2100RPM) results in going from about 33MPG to 47MPG. Similarly, at 75MPH, shifting from 4th to 5th (5200RPM, point of peak torque -> 4000RPM) results in a change from around 23MPG to 33MPG. I don't have a vacuum gauge, and perhaps my gearing is past the supposed point of returns for shorter gearing, but without ECU modifications, I would without a doubt be better served with taller gearing.
As an aside, I get pretty much constant fuel economy starting at around 48MPH up to nearly 65MPH.
Are you implying that playing with my timing and AFR would have equal impact to taller gearing? Also, at what point is shorter gearing too short?
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