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You should be using the GSR 5th but with ECU tuning you can get by with the higher rpms. LS motor with bigger bore is happier at a lower cruising RPM, but that is getting into some engine dynamics that isn't understood here.
Imagine doing 70 mph in 4th gear and getting 47+ mpg.
Vacuum gauge and driver mod is the first and best gains, then ECU tuning.
Myself I tend to use very light throttle, enough to pulled to 3500 rpm, then shift to next gear while not lifting off the gas pedal.
I hope to set up a video camera in the car to show how I drive the CRX and my old HB, then maybe others will understand.
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