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That fruit is in the predictive power of his theory in many different types of phenomena, all from minimal foundational principles/laws and original assumptions. They are listed in summary form starting midpoint on page 40 of the 2016 edition of his book, into page 41.
There is the internal mathematical calculations, but one needs experimental evidence as a touchstone. And there is that. As one particular example, why is it that his plasmas become highly energetic only in the presence of particular catalysts that just happen to have the correct ionization energies, namely multiples of 27.2 electron volts? This should not be according to the known laws of chemistry. And so on.
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(my bold)
markie, the following has been pointed out, in this thread in one way or another, by RC, hecd2, The Man, me, and Aepervius (likely others too, apologies for not mentioning you).
In physics (likely other branches of science too; I'm focusing here on physics), the degree to which the predictions of a theory match observational/experimental reality has value only to the extent that said theory is internally consistent. If it can be clearly shown that such an internal inconsistency exists, the most perfect predictions derived from the theory (even if there are a bazillion of them) counts for nothing.
Further, this fundamental feature of physics is something which you learn when you major in physics, to earn your BSc, MSc, or PhD (OK, I accept that you may have scraped through on your BSc which majored in physics, and not really fully absorbed this; and I'm assuming you got your degree from a real university, not a fake one).
As published, Mill's "theory" is internally inconsistent. Rathke published a paper (in 2005) showing just that. RC has pointed out several internal inconsistencies. So has hecd2 (and maybe others here too).
Of course, there are inconsistencies and there are inconsistencies ... sometimes they are minor, and don't really affect the core parts of the theory; sometimes they are easily fixable; sometimes ... However, the ones already publicly identified in Mills' (published) theory are not like these; rather, they are fatal (you can think of them as occurring very early in the theory development, a bit like discovering a serious mistake on page 1 of a 200 page mathematical proof).
True, Mills "published" a rebuttal (of at least the Rathke paper), two actually (maybe more). However, unlike the papers he published - on which Rathke based his - no rebuttal has been published in a relevant, peer-reviewed journal. And as both RC and Aepervius have already noted, it's highly unlikely he could (get such a rebuttal published in such a journal). A key reason why not is that the Mills rebuttal we have access to does not address the fatal flaw Rathke identified.
(And to head off something you might write: your own posts, and your own declarations, disqualify you from being able to post a credible "fix" to the identified fatal flaws. Your only option, as I see it, is to post a link to a paper in which the identified fatal flaws are fixed, published in a relevant peer-reviewed journal.)
This means, among other things, that we can ignore all the "hydrino" parts of Mills' claims. That leaves, AFAICS, "anomalous results", and promises of a Free Energy Generator ...