No. You should be extracting more than 5.5gal of wort for a 5.5gal batch. Not every system is the same, so depending on your system will need a preboil volume of anywhere from 6.5-7+gal. I brew inside on a gas range and I end up boiling off a little less than 1gal. My buddy brews outside on a big propane burner and boils off closer to 1.5gal.
BTW, this is a KILLER recipe. I bottled up some Darth a couple months ago and it just keeps getting better and better. I did an add an extra oz of cascade in the dry hop + an oz of Willamette just for fun. Give it plenty of time to carb up and then another 2 weeks in the fridge; you will be in CDA heaven