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It all depends upon your ability to use the information the MPGuino shows you. That's all it does, BTW--showing your current instantaneous MPG and a cumulative MPG reading.
I was able to take my CRX from 30 MPG to about 45 MPG over the course of several years by changing my driving style without any instrumentation. I calculated my MPGs per tank only, using the trip odometer and the amount of gas it took to fill the tank. That's over 160% of EPA combined--and there are people who regularly get over 200% of EPA by driving for economy.
I think the main thing that instrumentation will give you is a much shorter learning curve. I'm up to 150% EPA in my MINI in only 6 months in part by paying attention to the numbers on my ScanGauge.
-soD
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