Welcome to the site!
That's a fantastic write-up.
Although I have an engineering background, and I "know a lot about a lot", these things kinda mystify me. There have been several reported success stories - mostly on small cars but now also for a much larger application. But the skeptic in me still hesitates to buy anything like this without really understanding how they work.
Having said that, I'm even more tempted than before to get some and see what happens.
Also, you kind of allude to something that I'd like to see discussed a bit more - even though your gain is only 3 - 4 MPG, that is a 19% reduction in the fuel you use. I think that as a society, we stand more to gain by trying to reduce the fuel used on the big vehicles than to try to squeeze more MPG out of our tiny cars. The simple answer is for everyone to drive small cars, but that's obviously not something that everyone can do (although there are many unnecessary huge SUVs in the soccer-mom crowd - different subject there).
A lot more of us should try to do the best we can with what we have.
-Bob C.
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