Changes

This chart is an interpretation of attenuation in an infusion mash from Noonan’s book. With a single infusion mash at 149°F Noonan says in New Brewing Lager Beer an attenuation of 75-80% usually results.

I also find that if I step mash a normal grist (the same 1.080 OG used above), that is one without a lot of carapils, crystal or dark malts, a 146°/156° F step mash gives me about a 10% increase in attenuation. This would give me a 1.013 predicted FG, [((1-.85)*(1.080-1))+1]. I would suggest that you verify this with your own brewing setup.