I just brewed an American Wheat with straight DME and an Irish Stout with a partial mash and LME, and here are the differences I noticed. (5 gallon batch)
With 6 lbs. of DME, I got an OG of 1.060. With 6.6 lbs. of the LME and steeping 1 lb. of roasted grain, I got an OG of 1.056. Anyone else...