Easy.....do as I do;
Step 1 - Buy a shitload of grain
Step 2 - Have a bigassed mashtun - I use a 10 Gallon mashtun
Step 3 - Buy a refractometer to accurately measure your runnings
Step 4 - Batch sparge - 1st sparge is one brew, the 2nd sparge is the next - just like CUB does with VB and Crown (oops, there goes a trade secret!
)
Step 5 - Toss your efficiency calcs out the window, and
Step 6 - Buy more grain!
Cheers,
TL