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My experience with negative split hasn't been very positive.
At idle, it does drop the pulsewidths just about 10%, which coincides with your mileage #'s.
When trying negative split at high vacuum, low load cruising driving, the engine is "unstable" - it's almost like lean surge but slightly different resonance...
I didn't further the experiment because, IMO, it's a waste of time trying to wring out that last 1% of gas mileage on a rotary engine.
I drive and build my rotary engines for power - not fuel economy.
Building and tuning an RX-7 to pump out 400hp and getting 25mpg is a perfectly fine compromise in my book.
I have a daily driver other than the RX-7 for fuel economy - that's how I solve the gas mileage issue.
-Ted
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