Broadhopper, while I am reasonably sure you are indeed using less fuel with the current prop, the only real way to measure fuel economy is through MPG.
I have a Lowrance LMF200 with a paddle wheel speed sensor and a fuel flow probe. It displays MPG (and all kinds of other parameters) in real time. I replaced my gas gauge with it at my helm as it's also an incredibly accurate (within 1%) gas gauge. It will connect to a GPS with NMEA2000 outputs for very accurate speed readings.
I've discovered that my best cruising speed is around 32 MPH, but that I get nearly the same gas mileage between 28 and 40 MPH.
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