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Is lean burn an abrupt transition, like an on-off switch, or a more gradual transition? Somewhat gradual would seem to make more sense. I feel the torque at about 1500 rpm with commensurate reduction in vibration, as well as the beginning of effective induction harmonics where individual power pulses merge into a much smoother acceleration. in gears other than 5th the rpm threshold is somewhat lower, more so the lower the gear.
My last tank using my procedure (which is still evolving) was 57.58 mpg. My normal route is 40 miles round trip at an average speed of about 40 mph with 56 traffic lights to deal with.
Under normal conditions I never exceed 2500 rpm. Throttle position would vary between 20-50 % depending on rpm and gear choice, trying to keep vacuum as low as possible relative to throttle application.
I try to maintain a consistent load, but never use WOT, unless safety requires WOT. Some of this driving is on 45 mph congested roads that require light timing to avoid idling.
In those cases I use mini P&G with speed ranges of only a few mph. I am at the rear end of the group of vehicles drafting and P&Ging. Wot would not work very well, and other drivers would think I was some kind of nut case with all the distinct changes in speed.
regards
gary
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