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A simple low-tech way to measure relative consumption would be to build a circuit that drives a meter or a lamp off of a capacitively charged circuit that gets it's input off of one of the injectors. Obviously faster or longer pulses will convert to more throw or lighting of the meter.
It would be relatively easy to design using a buffer driver and an LED bar graph IC or other digital display. It would be more of a challenge to get real world numbers out of it, but calibrated to read a 1 at lowest load and 10 at the highest, one could certainly make some reasonable assumptions about efficiency.
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FritzR 
Threaded Mode
