When doing my Oktoberfest this last weekend, my deconcoction mash effiency was way higher than expected. I had to stop the boil at 60min rather than 90min in order to keep the OG at 1.059. The grist was 50:50 munich and vienna “German” provided by NB. I usually use Weyermann Pilsener malt and would not have bailed out to 60min, but somewhere I remember that darker malts do not have the same DMS potential. I had a fairly vigorous, open boil and a quick run through the Therminator. Any thoughts?

DMS is usually just a problem with Pilsner malt, you should be fine.

And decoction will typically get me a 5-10% bump in efficiency. These days I plan in in for decoction mashes.