Confirmation that utilization is independent of wort gravity:
BBR conducted actual measurements of the IBUs in 3 beers, one with a boil gravity of 1.127, one with late extract addition for a boil grav of 1.077, and one with a full boil at 1.068.
The same hopping schedule was used for all 3, and hop utilization is identical for all 3; the March 4, 2010 - BYO-BBR Experiment III:
http://www.basicbrewing.com/index.php?page=radio
(it also confirms that late addition can help make a lighter beer, though the effect is small).
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On deck: Little Bo Pils, Bretta Off Dead (Brett pale)
Secondary: Oude Bruin, Red Sky at Morning (Sour brown ale)
On tap: Saison Duphunk (sour), Amarillo Slim (IPA), Earl White (ginger/bergamot wit)
Bottled: Number 8 (Belgian Strong Dark Ale), Eternale (Barleywine), Ancho Villa (Ancho/pasilla/chocolate/cinnamon RIS), Oak smoked porter (1/2 maple bourbon oaked, 1/2 apple brandy oaked)
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