I have many problems to take care of to begin with (I have a 5 gallon pot, not big enough at all/ My thermometer goes wacky and only Celsius works) that being said I will buy a bigger pot/better thermometer next time I brew.
My grains were crushed at my LHBS. I had just under 5 gallons of water to 14Lbs grains at 164F to mash in with. My temperature during mash was around 147 about 15 minutes in, so i boiled around 3 cups of water to add to the mash. And its hard to say my volumes for sure due to the fact i wasn't able to drain all the wort out from the mash (I got maybe 5.5 gallons, 5 in my main pot, .5 in another) but post boil is a little under 5 gallons.