Dough in at 1.5 litres per kg for a protein rest @ 55.
Infuse up to around 3/1 for sacc rest.
Single infusion just plain old 3/1.
Warren -
14L per how ever many kg of grain I use.
I'm like Stu - always use the same amount of strike water. On a single batch I am aiming for a pre-boil of 28L, so if I strike with 14L, then before I raise to mash out I put in the same number of liters of water as I have KG of grain, then I will drain 14L or close enough on my first batch. 14L of sparge then gives me 14 more liters drained for a pre-boil of 28L.
All calculated to remove the need for thinking more than anything else. 14L + grain kg in Litres + 14L easy.
Normally gives me an actual L:G ratio of 2.5 to 3.5
For a single-sized batch, I mash whatever grain is required in my total pre-boil volume less my DunkSparge(tm) volume.
This usually turns out at ~5kg grain in ~(38-18) litres = ~1:4 or to answer the question, ~4:1.
And yet, it works!
But given your nick, you probably end up with 2.5:1 by the time you get the lid on, eh?
It's better when I brew alone. You can probably imagine the effect on a brewday of a Thirsty Boy and someone who SpillsMostOfIt...