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I finally tapped the injector signal instead of the ECU signal. The MPGuino seems to be working normally. Importantly, when coasting, the GPH displays reasonable values, i.e. it drops to a very low rate as it should. I'll keep this setup for a while and dial in the uSec per gallon number.
So, my original complaint, that the GPH jumped to a very high rate when coasting, appears to be related to using the ECU signal for fuel flow and reversing the injector open/closed pins to handle the negative signal.
I'd still like to use the ECU signal. I know now that the MPGuino is working correctly and that I'll have to dig into the code to resolve the issues.
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