I found my efficiency increased when I went to a thinner mash.
I did as well.
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+1
I went from about 1.2-1.3 quarts/lb of grain to 1.5 and had a noticeable increase in efficiency. I tried this based on what I read on t his forum some time ago and I figured I had nothing to lose since water is cheap. I also used to mash my ESB at 1 quart/lb based on Ray Daniel's recommendations in "Designing Great Beers" and my efficiency was not that great. When I thinned the mash to 1.5 quarts/lb it came up from around 70% to over 80%.
I think the only distinction to make here is as opposed to you, Denny and BrewBama, Megary is essentially a no-sparge brewer, so water to grain ratio is fixed in that case.
Where as a batch sparge brewer has the opportunity to remove or add sparge water based on their initial mash, someone like me or Megary for instance, can't do that.
An incremental change to water to grain ratio for a sparger means a thinner initial mash and more efficient first runnings with the possibility to just sparge with less, where as a no-sparge brewer would see that present itself as simply more up front volume and subsequently more back end volume. Which is of course part of what Megary is driving at with this post.
I agree 1000% percent on thinner mashes being more efficient, however, and i'm not afraid in my brewer to go very thin, so much so that I don't even track water to grain ratio at all. It just is what it is.