How about this for a way to estimate your final gravity. To simplify the
calculations ignore the amount of liquid in the concentrate.
Multiply the brix measurement times 4. This gives 272 or a specific gravity
of 1.272. Multiply the 272 times 2 (2 cans of juice) you get 544 or a
specific gravity of 1.544. Now dilute the juice with 5 gallons by dividing by
5 to get 109 or a specific gravity of 1.109 which sounds about right for the
starting gravity of wine.
JL