LehighAce06 wrote:because of the half pound of dme used to make the starter.
Ah, I thought you were saying that the starter was increasing your gravity, rather than just not diluting it as much as water would have.
5 gal @ 1.097 = 485 total points - 20 points = 465 points
So the unknown gravity of your original 4 gal would have been 465/4 = 1.116 , and if you'd just topped up with water, you would have been at 465/5 = 1.093 instead of 1.096.