Here are some interesting curves.
We can't move the spark plugs but they suggest that 
there may be some better BSFC to be had if the trailing
plug was fired at some time other than the leading plug.
Perhaps Tracy could have two ignition modes. Both plugs
fire at the same time in case one system fails
and an economy mode with the trailing plug firing at
optimum BSFC. If the engine quits or starts running strange
switch over to both firing at the same time.

With an instant flow meter read out on the instrument
panel in-flight  adjustment could be made to trailing spark
plug timing until BSFC was minimized.
 
One  of the curves indicate as the Hc in the exhaust goes
down so too does the exhaust gas temperature indicating
the excess fuel is burning in the exhaust manifold.
This bodes well for the RX8 engine exhaust gas temp that recycles the
unburned Hc. The other curve contradicts this conclusion :-)
 
Paul Lamar
 
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